A genuine offline installer for JustDecompile is typically 90 MB to 130 MB . If you see a 5 MB file, it’s the web installer or a fake.
If you need an offline installer for a specific version (e.g., 2020), your best bet is to ask on Telerik’s official forums or support if they’ll provide a legacy link. Sometimes support will give you a direct URL if you explain a valid use case (air-gapped network, corporate policy). They are surprisingly helpful when you don’t ask for a crack. telerik justdecompile offline installer link
Even without new updates, JustDecompile remains a powerful tool for isolated environments: A genuine offline installer for JustDecompile is typically
While the full "JustDecompile" solution is retired, the core Telerik JustDecompile Engine open source Telerik.com Sometimes support will give you a direct URL
: Decompiles assemblies to C#, VB.NET, and MSIL.