We are aware of this, and it is now fixed
We had a few people e-mail us about this, and so if you are one of those people then please forgive the repetition - but essentially this was caused by a minor folder structure issue:
As said above, this is fixed, however so that you don't have to re-download anything, you can simply fix this yourself by doing the following (takes just 1 minute):
1. In the 'BASSYNTH' folder itself on your computer, create a new folder called 'Instruments'. Now move the BASSYNTH.nki file into the new 'Instruments' folder that you just created.
2. Open Kontakt and for a batch resave (you can read how to do this on page 5 of the product manual)
Now close Kontakt, and open Komplete Kontrol again. This will now work