Revit 2025 – Missing External Applications

As you discovered, the UPI codes reference those add-ons. If you search xml files (Notepad++ search in files-feature) in the image folder for those UPI2 codes, you’ll find the xml file for that add-on and it will list the accompanying .msi / exe file. So for those failed installs, you could try to manually installing the missing bits. Or hack together a script that will install all missing components, whether they are missing or not.

A ‘clean uninstall’ as recommended by Autodesk usually doesn’t do a clean uninstall. My experience is there’s a lot of leftovers after a ‘clean uninstall’, making it difficult to re-install stuff. In those cases, I search / delete the registry for every ‘Autodesk’ line and also search / delete msi files for every ‘Autodesk’ file. It’s messy….

Edit: could very well be you get the message xyz is already installed when you try to install a missing component. In those cases, the Microsoft Troubleshooter could be a help.