It's due to the two different ways URD is selling the mod. I've bought version 1.0 and got an upgrade file for 1.1, for everyone else with this installation it should work just fine.
Everyone who bought after the release of version 1.1 gets v1.1 as one file if I'm not mistaken and is unable to use my version.
I can't fix this so I included an alternative installation with virtual drivers which includes all the features except the UI icons.