General Information
On the 30th of September the following was released:
- ISL Light 5.0.2551.184 for Windows (release_date=2026-09-30, build=7f19a14b7c560244a817ab2ee16c8bbe81673298, platform=win32,os_version=0x0a000000-0x7fffffff)
- ISL Light 5.0.2551.184 for macOS (release_date=2026-09-30, build=7f19a14b7c560244a817ab2ee16c8bbe81673298, platform=mac, os_version=0x0e0000-0x2effff)
- ISL Light 5.0.2551.184 for macOS Apple silicon (release_date=2026-09-30, build=7f19a14b7c560244a817ab2ee16c8bbe81673298, platform=macarm64, os_version=0x0e0000-0x2effff)
- ISL Light 5.0.2551.184 for Linux (release_date=2026-09-30, build=7f19a14b7c560244a817ab2ee16c8bbe81673298, platform=linux64, os_version=0x050fc10000022300-0xffffffffffffffff)
- ISL Light Client 5.0.2551.184 for Windows (release_date=2026-09-30, build=7f19a14b7c560244a817ab2ee16c8bbe81673298,platform=win32, os_version=0x0a000000-0x7fffffff)
- ISL Light Client 5.0.2551.184 for macOS (release_date=2026-09-30, build=7f19a14b7c560244a817ab2ee16c8bbe81673298, platform=mac, os_version=0x0e0000-0x2effff)
- ISL Light Client 5.0.2551.184 for macOS Apple silicon (release_date=2026-09-30, build=7f19a14b7c560244a817ab2ee16c8bbe81673298, platform=macarm64, os_version=0x0e0000-0x2effff)
- ISL Light Client 5.0.2551.184 for Linux (release_date=2026-09-30, build=7f19a14b7c560244a817ab2ee16c8bbe81673298, platform=linux64, os_version=0x050fc10000022300-0xffffffffffffffff)
- ISL AlwaysOn 5.0.2551.184 for Windows (release_date=2026-09-30, build=7f19a14b7c560244a817ab2ee16c8bbe81673298, platform=win32, os_version=0x0a000000-0x7fffffff)
- ISL AlwaysOn 5.0.2551.184 for macOS (release_date=2026-09-30, build=7f19a14b7c560244a817ab2ee16c8bbe81673298, platform=mac, os_version=0x0e0000-0x2effff)
- ISL AlwaysOn 5.0.2551.184 for macOS Apple silicon (release_date=2026-09-30, build=7f19a14b7c560244a817ab2ee16c8bbe81673298, platform=macarm64, os_version=0x0e0000-0x2effff)
- ISL AlwaysOn 5.0.2551.184 for Linux (release_date=2026-09-30, build=7f19a14b7c560244a817ab2ee16c8bbe81673298, platform=linux64, os_version=0x050fc10000022300-0xffffffffffffffff)
This release is available for Hosted Service users.
Update 5.0.2551.192
We have identified an issue affecting users installing ISL Light on computers running macOS 27, where the installation could fail silently and the application kept prompting to install or run on every start. This issue affects version 5.0.2551.184 on macOS 27 and is now resolved.
On 6th of October the following was released:
- ISL Light 5.0.2551.192 for Windows (release_date=2026-10-06, build=1e1966ebbd4f99ed448ffc45256e87826c3185c0, platform=win32,os_version=0x0a000000-0x7fffffff)
- ISL Light 5.0.2551.192 for macOS (release_date=2026-10-06, build=1e1966ebbd4f99ed448ffc45256e87826c3185c0, platform=mac, os_version=0x0e0000-0x2effff)
- ISL Light 5.0.2551.192 for macOS Apple silicon (release_date=2026-10-06, build=1e1966ebbd4f99ed448ffc45256e87826c3185c0, platform=macarm64, os_version=0x0e0000-0x2effff)
- ISL Light 5.0.2551.192 for Linux (release_date=2026-10-06, build=1e1966ebbd4f99ed448ffc45256e87826c3185c0, platform=linux64, os_version=0x050fc10000022300-0xffffffffffffffff)
- ISL Light Client 5.0.2551.192 for Windows (release_date=2026-10-06, build=1e1966ebbd4f99ed448ffc45256e87826c3185c0,platform=win32, os_version=0x0a000000-0x7fffffff)
- ISL Light Client 5.0.2551.192 for macOS (release_date=2026-10-06, build=1e1966ebbd4f99ed448ffc45256e87826c3185c0, platform=mac, os_version=0x0e0000-0x2effff)
- ISL Light Client 5.0.2551.192 for macOS Apple silicon (release_date=2026-10-06, build=1e1966ebbd4f99ed448ffc45256e87826c3185c0, platform=macarm64, os_version=0x0e0000-0x2effff)
- ISL Light Client 5.0.2551.192 for Linux (release_date=2026-10-06, build=1e1966ebbd4f99ed448ffc45256e87826c3185c0, platform=linux64, os_version=0x050fc10000022300-0xffffffffffffffff)
- ISL AlwaysOn 5.0.2551.192 for Windows (release_date=2026-10-06, build=1e1966ebbd4f99ed448ffc45256e87826c3185c0, platform=win32, os_version=0x0a000000-0x7fffffff)
- ISL AlwaysOn 5.0.2551.192 for macOS (release_date=2026-10-06, build=1e1966ebbd4f99ed448ffc45256e87826c3185c0, platform=mac, os_version=0x0e0000-0x2effff)
- ISL AlwaysOn 5.0.2551.192 for macOS Apple silicon (release_date=2026-10-06, build=1e1966ebbd4f99ed448ffc45256e87826c3185c0, platform=macarm64, os_version=0x0e0000-0x2effff)
- ISL AlwaysOn 5.0.2551.192 for Linux (release_date=2026-10-06, build=1e1966ebbd4f99ed448ffc45256e87826c3185c0, platform=linux64, os_version=0x050fc10000022300-0xffffffffffffffff)
- ISL Player 5.0.2551.59 for Windows (release_date=2026-10-12, build=cfb6325fadcec56b7d6dac12e316fbe4f048aa9e, platform=win32, os_version=0x0a000000-0x7fffffff)
- ISL Player 5.0.2551.59 for macOS (release_date=2026-10-12, build=cfb6325fadcec56b7d6dac12e316fbe4f048aa9e, platform=mac, os_version=0x0e0000-0x2effff)
- ISL Player 5.0.2551.59 for Linux 64bit (release_date=2026-10-12, build=cfb6325fadcec56b7d6dac12e316fbe4f048aa9e, platform=linux64, os_version=0x050fc10000022300-0xffffffffffffffff)
- ISL AlwaysOn actions for Windows (release_date=2026-10-06, build=1e1966ebbd4f99ed448ffc45256e87826c3185c0, platform=linux64, os_version=0x06010000-0x7fffffff)
- ISL AlwaysOn actions for macOS (release_date=2026-10-06, build=1e1966ebbd4f99ed448ffc45256e87826c3185c0, platform=linux64, os_version=0x0a0e00-0x2effff)
- ISL AlwaysOn actions for Linux (release_date=2026-10-06, build=1e1966ebbd4f99ed448ffc45256e87826c3185c0, platform=linux64, os_version=0x030a000000021100-0xffffffffffffffff)
This release is available for Hosted Service users.
Improvements
ISL AlwaysOn - Desktop - Rebuild libdatachannel so new codesign cert is used (SPECIAL) [ISLALWAYSON-2098] More
Description
The libdatachannel library used by ISL AlwaysOn was rebuilt so that it is signed with the new code signing certificate.
ISL AlwaysOn - Desktop - Upgrade mbedtls to 4.1.1 (SECURITY) [ISLALWAYSON-2096] More
Description
Internal mbedTLS library was updated to version 4.1.1.
ISL AlwaysOn - Desktop - Actions for mac_universal (FEATURE) [ISLALWAYSON-2081] More
Description
Actions on macOS now support both platforms - mac and macarm64.
ISL AlwaysOn - Desktop - Speedup generic clipboard (FEATURE) [ISLALWAYSON-2089] More
Description
Pasting files that are copied from a remote clipboard is now faster. Chunks of file data are requested in advance and served from a buffer instead of waiting for each chunk to be fetched one at a time, which noticeably reduces transfer time for large files on slower connections.
ISL AlwaysOn - Desktop - Pause generic clipboard on startup (FEATURE) [ISLALWAYSON-2090] More
Description
Clipboard monitoring on the shared computer now starts inactive and begins reporting clipboard changes only after the session connection is fully established. Content copied before that point is not transferred; the next copy is picked up normally.
ISL AlwaysOn - Desktop - Expand clipboard support with html, rich text, csv, XML Spreadsheet (FEATURE) [ISLALWAYSON-2092] More
Description
Clipboard sharing in a remote session now transfers more than plain text. Content copied from applications such as Excel, Word or a browser keeps its additional representations (HTML, rich text, CSV, XML Spreadsheet and Excel formats), and images copied from applications that only offer PNG or newer bitmap formats are now transferred as well. The extra formats are only fetched from the source application when the target application asks for them, and paste attempts are retried if another application temporarily holds the clipboard.
ISL AlwaysOn - Desktop - Call disconnect on stop_listening (DEFECT) [ISLALWAYSON-2091] More
Description
Users experienced an issue where stopping clipboard sharing could hang in some cases, when the helper process handling the clipboard was not running at that moment, leaving the clipboard connection open instead of closing it. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL AlwaysOn - Desktop - Fix lazy resolution of clipboard text (DEFECT) [ISLALWAYSON-2097] More
Description
When using the option to paste clipboard content by simulating typing, clipboard entries that applications provide only on demand (for example text copied from some office applications) could be typed as unreadable content or not typed at all. The text form of the clipboard is now resolved where the clipboard actually lives and is limited to a reasonable length before typing.
The defect was fixed.
ISL Light - Desktop - Rebuild libdatachannel so new codesign cert is used (SPECIAL) [ISLLIGHT-7647] More
Description
The libdatachannel library used in ISL Light was rebuilt so that it is signed with the new code signing certificate.
ISL Light - Desktop - Upgrade mbedtls to 4.1.1 (SECURITY) [ISLLIGHT-7646] More
Description
Internal mbedTLS library was updated to version 4.1.1.
ISL Light - Desktop - Notify ICP that the Windows client is WebAuthn capable (FEATURE) [ISLLIGHT-6197] More
Description
ISL Light on Windows now reports to the server that it supports WebAuthn-based two-factor authentication, so security key login can use WebAuthn when the server offers it.
ISL Light - Desktop - Add support for Wayland on Linux (FEATURE) [ISLLIGHT-6616] More
Description
Added support for screen sharing and remote control on Linux computers running a Wayland desktop session, including support for multiple monitors.
ISL Light - Desktop - Add multi monitor support for Wayland (FEATURE) [ISLLIGHT-6662] More
Description
Added support for multiple monitors when sharing the desktop on Linux with Wayland. Operators can now select and view each remote monitor separately.
ISL Light - Desktop - Add input support for Wayland (FEATURE) [ISLLIGHT-6737] More
Description
Keyboard input is now supported when controlling a remote Linux computer running a Wayland session, including characters that require multiple key presses or modifier keys.
ISL Light - Desktop - Add CTRL+ALT+END to generate SAS (FEATURE) [ISLLIGHT-7529] More
Description
Added a keyboard shortcut for sending Ctrl + Alt + Del to the remote computer, since that combination is reserved by the local device. The shortcut can be changed under the shortcut settings, where shortcuts with multiple keys are now displayed and a warning is shown if the chosen combination is already used by another action.
ISL Light - Desktop - Add customizable shortcuts for certain features (FEATURE) [ISLLIGHT-7537] More
Description
Added a configurable keyboard shortcut for Paste Typing (simulate typing), which pastes clipboard contents by simulating keystrokes on the remote computer. The default shortcut is Right Ctrl+Shift+V and it can be changed in the shortcut settings. The Tools menu item was renamed from "Paste" to "Paste Typing" and now shows the assigned shortcut.
ISL Light - Desktop - Split session code (FEATURE) [ISLLIGHT-7562] More
Description
Session codes are now displayed and entered in groups of three digits to improve readability.
ISL Light - Desktop - Add feedback (FEATURE) [ISLLIGHT-7573] More
Description
New menu items were added to the main window and dashboard menus: "Send Feedback" (available only on hosted service accounts), "What's New" and "Help & Manuals". Each item opens the corresponding page in the default web browser; when logged in on the hosted service, the feedback page keeps the user logged in. The items can be hidden with the command line argument --on-load "customization?disable_feedback=true".
ISL Light - Desktop - Redesign Start New Session (FEATURE) [ISLLIGHT-7578] More
Description
The window shown while an operator waits for the client to join a session was redesigned. It now shows the waiting status and how long the session has been waiting in the status bar, allows editing the session name directly, and provides email invitation actions and settings from the same window.
ISL Light - Desktop - Add login dialog args supporting persistent login (FEATURE) [ISLLIGHT-7602] More
Description
ISL Light now supports persistent login on the server side, so users can stay logged in between application starts. Two new command line arguments were added:
- --skip-persistent-login, which disables persistent login for that run
- --show-native-app-login, which requests the username and password login screen.
Persistent login is also automatically skipped when ISL Light is started with --username, --password or --web-login.
ISL Light - Desktop - Install ISL Light in Session (FEATURE) [ISLLIGHT-7603] More
Description
Added an option to install ISL Light on the client computer during an active session. The operator can start it from Tools > Install ISL Light, and the client can start it from the ISL Light Client Settings menu. When the installation is started by the operator, the operator's customization is used; when started by the client, the client's customization is used. The menu item can be enabled or disabled through customization.
ISL Light - Desktop - Use new web "native-app-web-login-stage" in ISL Light's login/join-session view (FEATURE) [ISLLIGHT-7605] More
Description
The login screen now shows the "Join a Session" form next to browser-based login, with short descriptions under both the login and join titles. The join form stays visible while browser login is being offered and is hidden once login moves to the waiting or authentication step, and sign-up content is shown below the login form during those steps.
ISL Light - Desktop - Simplyfing QML Code for a vertical separator (FEATURE) [ISLLIGHT-7630] More
Description
The vertical separator on the login screen now uses a fixed height again, matching the other vertical separators in the application. Two warnings related to the login view and dashboard window were also resolved.
ISL Light - Desktop - Wayland improve multimonitor streaming (FEATURE) [ISLLIGHT-7632] More
Description
Desktop sharing on Linux systems using Wayland was improved for setups with multiple monitors, reducing screen blinking, tearing and visual artifacts. On processors that support it, change detection between screen frames now uses AVX2 instructions, which lowers the processing cost of streaming.
ISL Light - Desktop - Pause generic clipboard on startup (FEATURE) [ISLLIGHT-7634] More
Description
Clipboard monitoring on the shared computer now starts inactive and begins reporting clipboard changes only after the session connection is fully established. Content copied before that point is not transferred; the next copy is picked up normally.
ISL Light - Desktop - Expand clipboard support with html, rich text, csv, XML Spreadsheet (FEATURE) [ISLLIGHT-7635] More
Description
Clipboard sharing in a remote session now transfers more than plain text. Content copied from applications such as Excel, Word or a browser keeps its additional representations (HTML, rich text, CSV, XML Spreadsheet and Excel formats), and images copied from applications that only offer PNG or newer bitmap formats are now transferred as well. The extra formats are only fetched from the source application when the target application asks for them, and paste attempts are retried if another application temporarily holds the clipboard.
ISL Light - Desktop - Speedup generic clipboard (FEATURE) [ISLLIGHT-7637] More
Description
Pasting files that are copied from a remote clipboard is now faster. Chunks of file data are requested in advance and served from a buffer instead of waiting for each chunk to be fetched one at a time, which noticeably reduces transfer time for large files on slower connections.
ISL Light - Desktop - Polish Wayland implementation (FEATURE) [ISLLIGHT-7638] More
Description
Screen sharing on Linux systems running Wayland was hardened. Frames that a compositor delivers with unexpected sizes or row padding are now handled correctly instead of being shown incorrectly or dropping the stream, and starting or stopping screen sharing no longer leaves the capture in a broken state when initialization fails.
ISL Light - Deskop - Supports-u2f-webauthn missing in one code path (DEFECT) [ISLLIGHT-7512] More
Description
In some login flows the application did not report support for security key (U2F/WebAuthn) two-factor authentication, which could prevent logging in with a security key. The login flow was unified so the capability is always reported.
The defect was fixed.
ISL Light - Desktop - Session code is not split when entered using numeric keypad (DEFECT) [ISLLIGHT-7567] More
Description
Users experienced an issue where the session code entered with the numeric keypad was not split into groups as it is when typed with the regular number keys.
The defect was fixed.
ISL Light - Desktop - Missing support for cmdline --on-load "main?logo=..." (DEFECT) [ISLLIGHT-7582] More
Description
The command line option to set a custom logo when starting the application (--on-load "main?logo=...") had no effect. The logo can now be specified either as a local file path or as a web address, and supported image formats are BMP, JPG, JPEG, PNG and SVG; the specified image is shown in place of the default logo.
The defect was fixed.
ISL Light - Desktop - Fix plugin channel assignment order (DEFECT) [ISLLIGHT-7604] More
Description
In some sessions the clipboard did not work correctly right after the remote desktop view was opened, because session components were initialized in an inconsistent order. The initialization order was made deterministic and clipboard now works from the start of the first desktop stream.
The defect was fixed.
ISL Light - Desktop - ISL Light Client is expanded after joining session when touch-pad cmdline is used (DEFECT) [ISLLIGHT-7606] More
Description
Users experienced an issue where the ISL Light Client window stayed larger than needed after joining a session when the touch pad command line option was used. The window sizing was corrected so the client shrinks to its normal session size.
The defect was fixed.
ISL Light - Desktop - Whiteboard tools shown on incorrect display to client AKA wayland (DEFECT) [ISLLIGHT-7607] More
Description
Whiteboard drawings and pointers made by the operator were shown on the wrong display on Linux computers running a Wayland session. Whiteboard tools are now disabled when the remote computer uses Wayland.
The defect was fixed.
ISL Light - Desktop - Don't send shortcut keys to remote (DEFECT) [ISLLIGHT-7608] More
Description
When an operator used a keyboard shortcut during a remote session, the keys that make up the shortcut were also sent to the remote computer, which could trigger unintended actions there. Shortcut keys are now handled locally only and are no longer forwarded to the remote side.
The defect was fixed.
ISL Light - Desktop - Incorrect control state shown when connecting to Wayland machine (DEFECT) [ISLLIGHT-7631] More
Description
When connecting to a Linux machine running Wayland, the session showed an incorrect remote control state, for example indicating that control was available when the remote user had only allowed screen sharing without input. The control state shown to the operator now reflects what the remote user actually granted, and clipboard sharing is disabled when input is not permitted.
The defect was fixed.
ISL Light - Desktop - Call disconnect on stop_listening (DEFECT) [ISLLIGHT-7633] More
Description
Users experienced an issue where stopping clipboard sharing could hang in some cases, when the helper process handling the clipboard was not running at that moment, leaving the clipboard connection open instead of closing it. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Linux Wayland Stability fixes ep. 2 (DEFECT) [ISLLIGHT-7636] More
Description
Users experienced instability when sharing their screen on Linux systems running Wayland, including sessions that could freeze or stop when the desktop compositor behaved unexpectedly. Keyboard input handling when controlling such a computer was also improved.
The defect was fixed.
ISL Light - Desktop - App stuck in "Install or Run" loop, never registers as installed (DEFECT) [ISLLIGHT-7643] More
Description
On macOS, installing ISL Light could fail silently so that the application was never registered as installed and kept prompting to install or run it on every start. The installation procedure was redesigned so that running instances are closed reliably and installation errors are reported, and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Fix lazy resolution of clipboard text (DEFECT) [ISLLIGHT-7645] More
Description
When copying content that the system provides only on request (for example large or specially formatted text copied from some applications), using "Paste (simulate typing)" in a session could type unreadable or empty content instead of the actual text. Clipboard text is now resolved on the side where it is copied and the typed text is limited to a reasonable length.
The defect was fixed.
ISL Player - Desktop - Upgrade mbedtls to 4.1.1 (SECURITY) [ISLPLAYER-351] More
Description
Internal mbedTLS library was updated to version 4.1.1.
ISL Player - Desktop - Text in tabs is shortened in all tabs on mac (DEFECT) [ISLPLAYER-348] More
Description
Users on macOS experienced an issue where tab labels were shortened with an ellipsis, for example a recording name shown as "Recor...". Tab labels are now shown in full and scroll buttons appear when not all tabs fit in the window.
The defect was fixed.
ISL Player - Desktop - Player hangs with white screen when opening .isr recordings (DEFECT) [ISLPLAYER-350] More
Description
Users experienced an issue where ISL Player stopped responding and showed a blank window when opening certain recording files, for example when a file was incomplete or could not be read. Playback can also no longer be started while a recording is still being indexed; a notice is shown instead, and playback can be started once indexing finishes.
The defect was fixed.