Cannot find RevitUIAPI.dll even after adding to vs studio references in project

[ryan_chesnut]

Having an issue accessing the RevitUIAPI.dll in code. RevitAPI.dll 

See code screenshot. Using Revit 2025 and .NET8.0

[jeremy_tammik · Accepted solution]

Have you installed Revit on your local system? I suggest that you add the references to the Revit API assembly DLL manually and browse to their location in the same directory as Revit.exe itself in the Visual Studio  UI. Also, make sure to set their Copy Local flag to false.

[ryan_chesnut]

Got it sorted, took a couple add and remove references 

Thanks for the quick responses here. Getting acclimated to the development process.