Welcome to the forum @Stone1888. You can see this thread here and also search Drum Drops in the forum search, that will pull up a few other posts.
From what I gather, DD dropped support for BFD, but previous installed DD (FXpansion days) should still work with the inMusic BFD3. Have you added that serial to the LM? It might show authorized, but no download available. I don’t think any progress has been made on this front, so unless someone here has the old installer and is willing to upload it for you, you might be out of luck with BFD3. You could still import single velocity .wav files from the kit afaik, but that’s not cool.