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.
JustDecompile distinguishes itself through a suite of features designed to recover lost work and analyze third-party code:
)
if ($existing) Write-Host "Upgrading existing JustDecompile version $($existing.Version)" Start-Process msiexec.exe -Wait -ArgumentList "/i "$MsiPath " REINSTALL=ALL REINSTALLMODE=vomus /quiet /norestart /lv* "$LogPath "" else Write-Host "Performing fresh install" Start-Process msiexec.exe -Wait -ArgumentList "/i "$MsiPath " /quiet /norestart /lv* "$LogPath "" telerik justdecompile offline installer upd
If you have an existing account, you can access the offline installer by navigating to your account's downloads page. A Telerik support representative confirmed that the MSI file is made available here, and if it is not visible, contacting support can get a free license activated on your account to make it appear.
If you have previously installed it, or have the offline installer, it remains free for perpetual use. There are no "time bombs" in the software, meaning it will not stop working.
If your organization held active or historical commercial subscriptions or registered free trials with Progress, the files may still be hosted in your specific account vault. Log into the Telerik Account Center, navigate to Products & Subscriptions (or Trials ), select Download , and check the archives for the standalone MSI zip package. 2. Trusted Community Archives and Package Managers Progress Telerik has moved away from offering a
Whether you are looking to secure the final offline MSI installer for a legacy network environment or seeking to transition to its community-driven spiritual successor, this guide covers the architectural breakdown, installation safety, and modern alternatives. Technical Specifications: Telerik JustDecompile Specification 2024.1.131.0 Vulnerability Fix Mitigates CVE-2024-0219 (Privilege Elevation) License Type Freeware (Decompilation Engine is Open-Source) Core Targets .NET Framework (up to 4.8), C#, VB.NET, IL, WinMD, APPX Installer File Types Standalone MSI / Offline ZIP archive Why Developers Need the Offline Installer Update
She pulled the server offline physically and sat at her desk with a cup of coffee and a quiet resolve. First rule: restore the working tool, then patch the process so it never happened again. She copied the broken install directory to her laptop and opened JustDecompile’s manifest file. It contained version numbers, a URL, and a checksum — enough to reconstruct what the updater had intended to fetch.
| | Likely Cause | Solution | |-----------|------------------|----------------| | Installer fails with “Missing prerequisites” | .NET Framework or VC++ Redistributable not present offline | Download the required redistributables offline (e.g., .NET Desktop Runtime) and install first. | | “The installer was interrupted before completion” | Corrupted download or insufficient disk space | Verify SHA-256 checksum. Clear temp files. Ensure at least 500 MB free. | | Old version remains after installation | Windows Installer caching issue | Use msiexec /x ProductCode to force full removal first. | | Visual Studio extension not updated | VSIX package did not install | Manually install the VSIX from C:\Program Files (x86)\Telerik\JustDecompile\Extensions\ | | Plugin for Reflector or ILSpy is missing | Offline installer excludes optional components | Re-run installer, select “Custom” and tick all desired components. | If you have previously installed it, or have
According to security disclosures discussed on the Telerik Forums , all legacy versions of JustDecompile prior to the 2024 R1 release suffer from a privilege elevation vulnerability designated as . In local environments, lower-privileged users could manipulate the legacy installation packages to execute malicious code and seize control of the underlying Windows operating system.
Have you encountered a specific issue with the JustDecompile updater? Check the official Telerik forums or the #justdecompile tag on Stack Overflow. For urgent needs, remember that the offline MSI is your most reliable fallback.
: It quickly converts .NET assemblies (DLLs and EXEs) back into readable C#, VB.NET, or IL code, maintaining a high level of accuracy for complex logic.
Telerik JustDecompile is a highly efficient, free .NET decompilation tool used by developers worldwide to inspect assemblies, recover lost source code, and analyze compiled binaries. While the standard online stub installer works well for users with a continuous internet connection, many enterprise environments, offline workstations, and secure labs require an .