JustDecompile supports useful plugins like Reflexil (for assembly editing) and Decompiler to Visual Studio Project. Download these plugin files ( .dll or zip archives) from an internet-connected machine beforehand so you can load them manually in your offline environment.
As of 2025, Telerik continues to maintain JustDecompile, though major feature releases have slowed. The offline installer remains a priority for enterprise customers. Recent improvements include:
Capable of creating a Visual Studio project from a decompiled assembly, helping to recover lost source code.
I can provide the exact terminal scripts or dependency packages required for your setup.
If you have the .msi offline installer, you can deploy silently: telerik justdecompile offline installer
If you cannot find it, modify the download URL manually. For many Telerik products, the offline installer is hosted at: https://downloads.telerik.com/JustDecompile/JustDecompile_[Version].msi
Look specifically for the or Offline Installer link (typically packaged as an .msi or an expanded .zip archive containing all dependencies) rather than the standard light-weight bootstrapper execution file. Step 2: Transfer and Deploy
Accidentally deleted source code but have a compiled EXE? The offline installer can restore a surprising amount of logic (though comments and local variable names will be lost).
Compatibility & system requirements
| Feature | Web Installer | Offline Installer | | :--- | :--- | :--- | | | Yes (throughout installation) | No (only for initial download) | | Corporate Proxy Support | Often fails | Works perfectly | | Reusability | Single-use (caches temp files) | Permanent archive (e.g., ZIP or MSI) | | Version Control | Always gets latest (could break compatibility) | Locks a specific version | | Air-Gapped Networks | Impossible | Ideal |
Supports an open API allowing developers to create and load custom plugins locally.
: Keep a specific version of the tool archived so your entire team is debugging and decompiling on the exact same build. Portability
Enterprise development often occurs within highly secure networks, such as air-gapped labs or environments behind strict corporate firewalls. Offline installers allow administrators to vet the file once and deploy it safely across restricted workstations. 4. Archiving and Version Control The offline installer remains a priority for enterprise
Click on any class or method. The decompiled C# or VB.NET code will render instantly in the main code viewing panel.
| Tool | Offline Installer Available? | Cost | | :--- | :--- | :--- | | | Yes (single EXE, no installer) | Free (open source) | | ILSpy | Yes (portable ZIP) | Free (MIT license) | | dotPeek (JetBrains) | Yes (full MSI) | Free (registration required) | | Reflector (Red Gate) | Rare (mostly web) | Paid |
Go to the "Your Account" dashboard and select "Downloads."
For security, compare the SHA256 hash of the downloaded file against the hash provided on Telerik’s download page. This ensures the file has not been tampered with in transit. If you have the