I had the popup and installed version 4.0. Norton warned me and quarantined the file...
You and some other users are saved by antivirus, which just shows us that most of those who took the wrong step and install fake wallet had no protection whatsoever, which is so stupid that it's almost unthinkable. When we add to that cryptocurrency and lack of knowledge, it's easy money for those who are playing dirty games in background.
I think you shoud be safe, Norton is prevented that fake wallet to even install on your device. But you can try to make scan in safe mode with Norton and free version of Malwarebytes, this is much better way to remove all bad things from your OS. However, only 100% safe way is disc formating and installing of fresh OS.