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 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
: Easily converts compiled .dll and .exe files back into readable C#, VB, or IL code. telerik justdecompile offline installer
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: No internet connectivity required : The offline installer