I meant to answer this at the time but forgot, hopefully you've either figured it out yourself of heard back from support because untill you get your account/pasword and email sorted there's probably not much you, or I can do.
In answer to your other questions, the best way to set BFD1.5 BFD2 and BFD3 is to have all theaudio/data on a seperate drive for a couple of reasons. Firstly, it helps to spread the load of so much data being streamed in real time and so will halp performance when recording in sonar or any DAW.
Secondly, if you get a new computer you can just add the drive with all the BFD audio/data on and point BFD3 to where it is.
BFD3 can use all the kits from BFD1.5 and BFD2 as well as all the grooves so you don't have tyo keep the others but having said that, they don't take up much space.
If you want to uninstall BFD1.5 DO NOT do so until after you have opened up all those sonar projects that used it and swapped ove the drums to BFD3. THis is a long process and there's no real easy way to do it. BFD3 will not just do it automatically so when you get to that stage let us know and we can help you get down to it
Did you contact fxpansion and have they got back to you?
Scan UK 3XS Audio System
ASUS Prime Intel Z390-A
intel i9 10th gen 900k 3.7GHz
32GB Corsair DDR4 Vengeance LPX 2666MHz
5000GB SSD PM981 M.2 PCIe (OS)
500GB SSD drive for BFD Samples
Focusrite Scarlett 4i4