For paying customers, the offline .msi or .zip is available inside the Telerik account portal under “Downloads” → “Additional Downloads” → “JustDecompile Offline Installer.”

Once you have downloaded the .msi or .zip file on an internet-connected machine, transfer it to your offline environment via a secure USB drive or internal network share. Option A: Using the MSI Offline Installer Double-click the downloaded JustDecompile.msi file. Accept the End User License Agreement (EULA).

The safest way to get the offline installer is through the Progress Telerik backend: Go to the Telerik JustDecompile Product Page . Click on . You will be prompted to log in or create a free account.

The official Telerik forums and feedback pages are still accessible, though community activity has decreased significantly. For active help, consult Stack Overflow or Reddit communities.

after this point – the decompiler works entirely offline.

For power users, the tool supported command-line exports, making it incredibly easy to automate the generation of Visual Studio projects without ever opening the GUI. Excellent Alternatives to Telerik JustDecompile

Complete Guide to Downloading the Telerik JustDecompile Offline Installer