I’m using Archicad 27, but I can’t use the plugin. I installed the latest version - Datasmith Exporter - UE 5.2.1 (Windows), which is compatible with Archicad 23 - 26 and Twinmotion 2023.1.2, but during installation, it requests version 5.0.2, which I couldn’t find for download.
The closest iteration available is 5.0.3
It’s basically 5.0.2 with hot-fixes.
I assume the installer process request the Datasmith Installer 5_0_2 to uninstall.
If that is correct, you can find it here https://unrealstudio.epicgames.com/UnrealDatasmithArchicadExporter_5_0_2.msi