hey guy
both ff6 and bms installed on my system also. when installing ff6 it asks if it can delete the other before installing. if you don’t want or know how to mess with regedit,
the easy way is to copy backup of original, let ff6 delete it, install ff6, reinstall original and replace it with you backup.
edit: this is not true for bms 4.33.u1. sorry, i was remembering from older versions