I have a Mac so this may or may not help
I ran a search in may Mac that looked in all hard drives both internal and external
I searched for the word crush
the search came up with lots of results for content and all sorts
I found the presets in an external drive I didn’t expect to find them in
in my case in a folder called
FXpansion/BFD Crush/Installer/Payload/BFD3System/Presets
it don’t matter where yours are or what the folders are called, what matters is finding them
then I opened BFD3 in standalone mode
File/Import Presets
then navigated to the location I found the presets in
highlighted all of them and imported them
then did the same thing for the Kits now that I’d found that folder too (along side the presets folder), then imported those too in the same way (File/Import Kits in BFD3)
It all worked fine
and realising this, I imported my missing presets and kits for VRT too
and all that worked out fine as well
I hope this works for you guys if you’ve not managed to solve this problem yet