Are you trying to with this specific file, or are you looking to develop a new plugin for AutoCAD?
The acadplugin.dll file is a dynamic link library commonly used for extending functionality in through custom .NET plugins . Because it is typically a custom-built file rather than a standard system component, you won't find a single official "download" link. Instead, it is usually obtained by building a project from source or as part of a specific software package. How to Obtain or Use acadplugin.dll acadplugin.dll Download
If the plugin fails to load, ensure you are using the correct build for your AutoCAD version (e.g., .NET 8.0 for AutoCAD 2025/2026 ). Are you trying to with this specific file,