Check for missing dependencies; sometimes a plugin requires additional managed assemblies to be present in the same directory.
: Avoid downloading .dll files from generic "DLL download" websites, as these files can be outdated or contain malware. Always prefer official sources like the Autodesk App Store or trusted developer repositories.
: You can find open-source implementations, such as the AcadPlugin repository on GitHub , where you can clone the code and build the DLL yourself using dotnet build .