The UC installs under Origin Games in Program Files. It won't use your Saved Games either. You'll have to move them to the new saved files in Documents.
The save files are not the Program files- JIC
So, once you get it installed and running, move your older Doc files to the new game- Documents\EA Games\The Sims™ 2 Ultimate Collection
I'd uninstall the old game once you know the new one is working.
Comments
The UC installs under Origin Games in Program Files. It won't use your Saved Games either. You'll have to move them to the new saved files in Documents.
The save files are not the Program files- JIC
So, once you get it installed and running, move your older Doc files to the new game- Documents\EA Games\The Sims™ 2 Ultimate Collection
I'd uninstall the old game once you know the new one is working.