Telerik Justdecompile Offline - Installer
If you need a reliable, officially signed offline installer for Telerik JustDecompile:
If Telerik has removed offline installers entirely (they occasionally do), switch to ILSpy – it is open source, actively maintained, and fully offline-capable.
Telerik JustDecompile was a popular free .NET decompiler, it has been officially retired by Telerik. Because the product is no longer actively maintained, finding a direct "offline installer" from the official site now involves specific workarounds or looking at its successor. Status of the Offline Installer
The official web installer often required an active internet connection to download components during setup. However, Telerik previously offered two primary ways to obtain a standalone version for offline use: ZIP File Distribution : Telerik provided a ZIP version of JustDecompile
that required no installation. This is the most "offline-friendly" version, as you can simply extract it to a USB drive or a local server. Account MSI Download : For users with a Telerik account, a standalone MSI installer was typically available on the Downloads page Key Features for Offline Use
Even without a constant connection, JustDecompile offered robust features for assembly browsing: One-Click Framework Loading
: Quickly load core assemblies for .NET 2 through 4.5, WinRT, and Silverlight. Project Recovery
: Use the "Create Project" feature to export decompiled assemblies into a Visual Studio project. High Performance
: It was marketed as being up to 10 times faster than competing decompilers. Current Alternatives
Since Telerik has retired JustDecompile, they officially recommend these active, free alternatives for offline .NET decompilation:
: A powerful tool from JetBrains that can act as a local symbol server. : A widely used open-source decompiler. CodemerxDecompile
: JustDecompile’s engine was open-sourced and has been continued by some communities under names like CodemerxDecompile or another modern alternative instead?
Download the Full Ultimate package Offline in UI for .NET MAUI 10 Nov 2023 —
Telerik JustDecompile Offline Installer: A Complete Guide Telerik JustDecompile was a free, high-performance .NET assembly browser and decompiler. However, as of April 2, 2024, Progress Software has retired JustDecompile, meaning it is no longer available for new downloads or supported as part of their official portfolio. If you previously downloaded the tool, you can continue to use it perpetually.
For users needing to set up the tool in environments with limited connectivity, an offline installer is the most reliable method. Features of Telerik JustDecompile
JustDecompile was known for being up to 10 times faster than leading competitors in assembly decompilation. Key features included:
Multi-Language Support: Ability to decompile .NET assemblies into C#, VB.NET, and MSIL.
Visual Studio Project Creation: Users can generate a full Visual Studio project from a decompiled assembly, making it invaluable for recovering lost source code.
Extensibility: An open API and built-in Plugin Manager allow users to add functionality like assembly editing via Reflexil or deobfuscation via De4Dot.
Fast Navigation: Features CamelCase search and "Find Usages" to quickly pinpoint symbols and types across all loaded assemblies. How to Access the Offline Installer telerik justdecompile offline installer
While official new downloads are discontinued, licensed users or those who had previously registered may still access installers through their accounts. Telerik JustDecompile is Retired
Here’s an interesting and useful summary regarding the Telerik JustDecompile offline installer:
Teaching a .NET reverse-engineering workshop? Venue Wi-Fi is notoriously unreliable. Distribute the offline installer to all attendees on a USB stick before you begin.
Imagine you need to decompile an assembly that was compiled against a specific version of JustDecompile’s engine. Using the web installer might pull a newer version that behaves differently. The offline installer lets you archive version 2023.1.123 forever.
Add a JustDecompile.exe.config file with the setting:
<add key="PortableMode" value="true"/>
This forces all settings and caches to stay within the app folder, not %AppData%, making the entire installation USB-portable.
Before running JustDecompile on your offline machine, ensure the machine has the correct prerequisites installed. If the app crashes on startup, you are likely missing one of these:
If you have the .msi offline installer, you can deploy silently:
msiexec /i "Telerik.JustDecompile.2024.1.1.msi" /quiet /norestart
To suppress the license dialog:
msiexec /i "JustDecompile.msi" SKIP_LICENSE=1 /quiet
The Telerik JustDecompile Offline Installer is more than just a download—it’s a strategic tool for serious .NET developers. It liberates you from the whims of the internet, empowers secure deployment in air-gapped networks, and ensures reproducibility in your development toolchain.
Whether you are a solo developer who frequently works on a train, an IT admin managing 500 workstations, or a security researcher analyzing malware in a sandbox, the offline installer is your best friend.
Next Steps:
Have you used Telerik JustDecompile’s offline installer in a unique scenario? Share your experience in the comments below. For more .NET tooling guides, subscribe to our newsletter.
Telerik JustDecompile is a professional-grade, free tool designed to decompile compiled .NET assemblies (DLLs and EXEs) into readable C#, VB.NET, or MSIL code. While it has been a staple in the .NET ecosystem for years, it was officially retired by Progress Telerik. New official downloads are no longer available on the main Telerik product page, though users who previously downloaded it can continue to use it. Core Features JustDecompile FAQ - Telerik
Telerik JustDecompile is a high-performance, free tool developed by Progress Telerik for browsing and decompiling .NET assemblies. While many modern developer tools rely on online installers or NuGet feeds, the offline installer remains a popular choice for developers working in air-gapped environments or those who prefer a single, portable executable for quick deployment. Review: Telerik JustDecompile (Offline Edition)
Ease of InstallationThe offline installer is straightforward, allowing you to bypass the need for a constant internet connection during the setup process. This is particularly useful for enterprise environments with strict firewall rules. However, users should note that as of 2025, Telerik has transitioned many products to a new licensing mechanism that may still require a one-time activation or specific DLL references. Key Features & Performance
Versatile Decompilation: Easily converts compiled .dll and .exe files back into readable C#, VB, or IL code.
Integrated Search: Includes a robust symbol-browsing feature that helps you navigate complex codebases quickly.
Extensibility: Supports plugins (like the Assembly Editor or Reflexil), though these may require manual configuration when using the offline version. If you need a reliable, officially signed offline
Speed: Known for being incredibly fast, it handles large assemblies without the lag often seen in browser-based tools. Pros
Completely Free: Unlike many Telerik UI suites, JustDecompile is a free utility.
Clean UI: It maintains the polished, professional interface Telerik is known for.
Reliable Support: Even as a free tool, it benefits from the extensive documentation and community resources provided by Progress Telerik. Cons
Stagnant Updates: Some users have noted that while the tool is reliable, feature updates are less frequent than Telerik’s paid UI components.
Licensing Friction: Recent changes to the Telerik licensing runtime (Q1 2025) have introduced occasional "Could not load file or assembly" errors for some users, which may require manual troubleshooting. Verdict
If you need a reliable, professional-grade .NET decompiler that works without an internet connection, the Telerik JustDecompile offline installer is an excellent choice. It remains one of the best free alternatives to tools like dotPeek, especially for users who already operate within the Telerik ecosystem. JustDecompile FAQ - Telerik.com
Telerik JustDecompile is a tool that is no longer officially supported by Progress Telerik. While the official product page has been retired, you can still find ways to use it or its modern successor for offline needs. Telerik.com Current Status & Download Options
As of 2026, the original Telerik JustDecompile has reached its end-of-life. Telerik.com Official Offline Installer: Historically, Telerik provided an offline installer in formats via their JustDecompile FAQ page
. However, new downloads are officially discontinued on the main product site. The ZIP "No-Install" Method: A popular offline alternative was the ZIP file distribution
, which allowed users to run the tool from a USB drive or server without a formal installation process. Modern Successor (CodemerxDecompile):
Since the original engine was open-sourced (Apache 2.0 license), it was forked into CodemerxDecompile
. This version continues to be maintained and offers installers for Windows, Mac, and Linux. Telerik.com How to Install Offline (If you have the files) If you already possess the files from your Telerik account: MSI Installation:
Double-click the installer and follow the wizard. It may require an administrator account for configuration. ZIP Extraction: Simply extract the contents to a local folder. You can add %PROGRAMFILES(X86)%\Telerik\JustDecompile\Libraries Path environment variable to enable command-line usage. Connectivity Warning:
Be aware that some older Telerik installers might attempt to download the latest version of .NET Framework if it is not already present on the machine. Telerik.com Key Features for Offline Use Command Line Support:
JustDecompile.exe /out:[OutputDirectory] /target:[PathAndAssemblyName] to decompile assemblies without using the GUI. Project Export:
You can create full Visual Studio projects from decompiled assemblies by right-clicking them in the tree view. Open Source Engine:
The core decompilation engine remains available on GitHub for those who want to build their own local version of the tool. Telerik.com Alternatives for Offline Decompilation
If you cannot find the original Telerik installer, consider these widely used alternatives: If Telerik has removed offline installers entirely (they
Powerful debugger and assembly editor (No longer actively updated, but popular). The standard open-source .NET decompiler. A free standalone tool from JetBrains. JustDecompile FAQ - Telerik.com
Can decompiled code be directly exported from JustDecompile? Yes. We have "Create Project" from decompiled assembly functionality. Telerik.com
Installing without internet connection in Fiddler | Telerik Forums
Telerik JustDecompile Offline Installer: A Comprehensive Guide
Telerik JustDecompile is a popular .NET decompiler that allows developers to easily decompile and explore .NET assemblies. While the online version of JustDecompile is widely used, there are scenarios where an offline installer is preferred or required. In this article, we will discuss the Telerik JustDecompile offline installer, its benefits, and provide a step-by-step guide on how to install and use it.
What is Telerik JustDecompile?
Telerik JustDecompile is a free .NET decompiler that enables developers to decompile .NET assemblies into C# or VB.NET code. It supports a wide range of .NET frameworks, including .NET Framework, .NET Core, and .NET Standard. JustDecompile is a valuable tool for developers, researchers, and reverse engineers who need to understand the inner workings of .NET applications.
Benefits of Using an Offline Installer
While the online version of JustDecompile is convenient, there are several benefits to using an offline installer:
Downloading and Installing Telerik JustDecompile Offline Installer
To download and install the Telerik JustDecompile offline installer, follow these steps:
Installing Telerik JustDecompile Offline Installer
Once you have downloaded the offline installer, follow these steps to install JustDecompile:
Using Telerik JustDecompile Offline Installer
Once installed, you can launch JustDecompile from the Start menu (Windows) or Applications folder (macOS). To decompile an assembly, follow these steps:
Conclusion
The Telerik JustDecompile offline installer provides a convenient and flexible way to install and use JustDecompile without an active internet connection. By following the steps outlined in this article, you can easily download, install, and use JustDecompile offline. Whether you're a developer, researcher, or reverse engineer, JustDecompile is a valuable tool that can help you understand the inner workings of .NET applications.
Here’s a helpful, concise report on the Telerik JustDecompile offline installer.
To confirm you truly have a functional offline installation:
If everything works, you have successfully deployed the offline installer. You will notice that plugin updates and extension galleries will fail silently—that’s expected in an offline environment.