Last couple of years, I've only used the offline installer (automated by ninuzzu), default install (everything on C drive). No backup of vp_game_map.yaml. The default file works for me out of the box. I think all known projects are already listed in that file. Works perfectly. You might make sure that files are unblocked. I don't recall about running bats as admin. I might have done that although the bat tries to get admin permissions automatically for you. You might try rolling back completely/uninstalling and trying again.
Sorry, I can't be much more help. I did install manually years ago when the VP bridge was first introduced, but I've very much appreciated having the more automated approach. Had to do a hard system reset a couple of months ago, and I had no problem installing with v3.3 and nothing has changed in the Step 1 and Step 2 part of the process since v3.3.