If you encounter issues locating the offline installer link, or if you require an open-source tool, several excellent alternatives offer completely native offline installers.
JustDecompile is a free .NET decompiling tool developed by Telerik that allows developers to explore, decompile, and analyze .NET assemblies (EXE or DLL files) to view the source code in C# or IL (Intermediate Language). It's particularly valuable when the original source code is lost, documentation is missing, or you're tracking down a bug in a third-party library. telerik justdecompile offline installer link
Step 4: Locate JustDecompile and Select the Advanced Options If you encounter issues locating the offline installer
So, after this long story, here’s my advice: documentation is missing