Telerik Justdecompile Offline Installer ((free))

This allows you to build the core functionality yourself using Visual Studio if the standalone UI is unavailable. Recommended Alternatives

Once installed, you can launch JustDecompile from the Start menu (Windows) or Applications folder (macOS). To decompile an assembly, follow these steps:

If you are looking for a reliable way to analyze .NET assemblies without a constant internet connection, the Telerik JustDecompile offline installer