Telerik JustDecompile Offline Installer: Everything You Need to Know
The Telerik JustDecompile Offline Installer was a sought-after package for developers needing a robust .NET assembly browsing and decompilation tool without relying on a persistent internet connection. While the software has been a staple in the .NET ecosystem for years, its status has recently changed significantly. Current Status: Retired as of April 2024
As of April 2, 2024, Progress Software has officially retired Telerik JustDecompile.
No New Downloads: The official Telerik website no longer offers the product for new downloads.
Support Discontinued: Professional technical support and new feature updates for the tool have ended.
Legacy Use: Users who downloaded the tool prior to its retirement can continue to use it indefinitely on their local machines. Last Known Version and Security The final official version released was 2024.1.131.0.
Security Note: This specific version was released to address a privilege elevation vulnerability (CVE-2024-0219) found in previous installers. If you have an older version, it is recommended to ensure you are using this final, patched build if you have it archived. Key Features of the Offline Installer
When it was available, the offline installer (provided as an MSI or ZIP file) offered several key advantages for development environments:
Portability: The ZIP-based distribution allowed developers to run the tool from a USB drive or server without a full installation process.
Visual Studio Integration: It could create Visual Studio projects directly from decompiled assemblies, allowing for easy code recovery. telerik justdecompile offline installer upd
Broad Framework Support: It quickly loaded core framework assemblies for .NET 2 through 4.5.x, Silverlight, and WinRT.
Multi-Language Support: The tool was capable of decompiling assemblies into C#, VB.NET, and MSIL. Recommended Alternatives
Since official downloads are no longer available from Telerik, Progress recommends the following free alternatives for .NET decompilation:
dotPeek: A free standalone tool by JetBrains that decompiles .NET assemblies into C# or IL. ILSpy: An open-source .NET assembly browser and decompiler.
CodemerxDecompile: A community-driven evolution of the open-source JustDecompile engine.
For developers still requiring Telerik-supported products, the company suggests moving toward their modern suites like Telerik UI for ASP.NET Core or Kendo UI, which continue to offer offline installation options for their active components. JustDecompile FAQ - Telerik
As of April 2026, Telerik JustDecompile has been retired and is no longer supported by Progress Software. Official downloads were discontinued on April 2, 2024, and the product has not received official updates since approximately 2018.
Because it is a retired, free product, the original Telerik offline installer is difficult to source officially. Key Information Regarding JustDecompile
No Further Updates: The original JustDecompile is considered abandoned software by its original creators. Launch JustDecompile
Continued Usage: If you have an existing MSI or ZIP installer, it can still be used on modern Windows systems, although it may not support the latest .NET framework versions without manual assembly mapping.
Retirement Status: As of 2024, it is no longer part of the Progress Developer Tools portfolio. Best Alternatives for 2026
Since Telerik no longer updates JustDecompile, users looking for an updated .NET decompiler should consider the following options:
CodemerxDecompile: This is the community-driven successor created by the original developers to support .NET Core, .NET 5, 6, 7, 8+. ILSpy: An open-source .NET assembly browser and decompiler. JetBrains dotPeek: A free standalone .NET decompiler. For Offline Usage of Old Versions
If you must use the original Telerik tool offline, you must rely on third-party software archives that host the last available MSI installer (typically version 2014.1.225.0 or 2019.1.116.1), though you should verify the source's security.
To give you the most relevant information, could you tell me:
Are you trying to decompile older .NET Framework apps, or modern .NET 6-9+ applications? Do you need features like plugin support (Reflexil)?
If you tell me what you're working on, I can recommend the best tool for that specific task. Telerik JustDecompile is Retired
Report: Telerik JustDecompile Offline Installer Update Pro Tip: To avoid manual uninstall/reinstall each time,
Date: October 26, 2023 Subject: Availability and Status of Telerik JustDecompile Offline Installers
This paper examines Telerik JustDecompile's offline installer options, update mechanisms, and best practices for deploying and maintaining the tool in environments with restricted or intermittent internet access. It covers packaging strategies, version management, offline update workflows, integration with enterprise software distribution systems, and troubleshooting common issues. The goal is a practical, implementable guide for IT administrators and developers who need deterministic, secure control over JustDecompile installations and updates.
Pro Tip: To avoid manual uninstall/reinstall each time, you can script the update using command-line parameters. For example:
JustDecompileSetup.exe /quiet /norestart /log install.log
Combine with a batch file to automate updates across many offline workstations.
| Step | Action | Description |
|------|--------|-------------|
| 1 | Monitor Releases | Watch the Telerik Release Notes page for new JustDecompile versions. |
| 2 | Download New Offline Installer | From an internet-connected machine, download the latest offline installer. |
| 3 | Transfer via Secure Media | Move the installer via USB drive, secured FTP, or internal network share to the offline machine. |
| 4 | Uninstall Old Version (Recommended) | Some versions require a clean uninstall; others support in-place upgrade via the MSI. |
| 5 | Run the New Offline Installer | Execute the installer. It will detect the existing installation and upgrade components. |
| 6 | Verify | Launch JustDecompile and check Help > About to confirm the new version. |
Note: Plugin updates (for Reflector Pro, ILSpy plugins, etc.) are not included in the core offline installer and must be handled separately.
Progress Telerik has moved away from offering a direct "click-to-download" .exe offline installer on the main product page to streamline update delivery and reduce web server overhead.
To satisfy the "upd" part of your search, also download the JustDecompile_Updates.exe or note the built-in updater tool. Telerik provides a separate utility to check for delta updates without re-downloading the whole MSI.
| Limitation | Workaround |
|------------|-------------|
| No delta updates – You must download the full offline installer each time. | Use a download manager or Telerik’s CLI tools to fetch only changed files. |
| Plugin gallery inaccessible offline – Reflector plugins won't update. | Pre-download plugin .dll files and place them in %ProgramFiles%\JustDecompile\Plugins\. |
| Assembly metadata lookup fails – Online symbol servers (e.g., Microsoft Reference Source) are unreachable. | Pre-cache required symbols or use a local symbol server mirror. |
| License validation – The free version requires occasional online validation. | Contact Telerik sales for a permanent offline license key for enterprise environments. |