Dorico doesn’t install anything in the current user account. When you run the software, of course various files are created in the user-level Application Support and Preferences folders, but you can delete those files and Dorico will still run. So the problem is not that Dorico is installing something in one user account that is preventing it from running in another one. If Dorico is freezing in your new user account, I’d suggest that’s likely due to a problem with the audio device settings on that account: perhaps check in Edit > Device Setup whether or not the audio device setup is the same in each of the two user accounts.