Alex Pankratov :
Jan 22, 2018
When the installer is run it will check if there exists
registry key. If it does, then it will execute an update of bvckup2.exe in the folder specified by InstallLocation reg. entry.
Otherwise it will repeat the check with the HKLM version of the key:
If this key does NOT exist, then it will fall back to the new installation mode.
If you want to be able to update your installation from under regular user account, you will need to have it installed in that user's profile (the second path on your list). Also, if you have it installed in both places, make sure you are launching correct .exe.
The simplest thing to do would probably be to uninstall the program, first as regular user and second as the admin, selecting to keep the config data in both cases. Then, install it back, but just under the regular user.
Finally, if you want to troubleshoot this without reinstalling - toggle CapsLock on and start the update while holding Ctrl button down. This will open a console window with diagnostic log, which may give you some clues as to what's going on.