Well, the Cleanup didn't work, but I did find a workaround solution by downloading and installing everything onto my laptop and then copying the styles folder over to my normal computer.

For future reference, do you know if there is a way to completely uninstall all BiaB/RealBand files (except songs of course) from one's computer, rather than just the applications? Just asking in case I need to do a complete fresh re-install in future.

No worries if you're unsure, I can ask tech support as I think I will still contact them despite my workaround.

Thanks once again for the assistance!