Forgot to mention I've already got the latest version of the addin. My OS is Windows 10 64 pro, if it has to be mentioned.
It has to be said that a couple of friends of mine had the same problem. We needed to exchange ifc models between archicad and revit for a competition, and neither of them could properly run the addin. Our version of Revit is spanish located, so could it be an issue there?
i7 3770K / MSI GS73VR 7RF i7 7700HQ
16 gb
GTX 3060 / GTX 1060
Windows 10
ArchiCAD 25 SPA