Native Instruments software and hardware products are not supported under macOS 10.15. Please do not install macOS 10.15 if you are using Native Instruments products.
We are currently conducting systematic tests to offer full compatibility as soon as possible after the official release. Please check this page or your Native Instruments product's specifications page regularly to obtain information on the current operating system requirements.
Important Note: 10.15 Catalina will terminate the operability of NI legacy hardware as described in this article.
For further informations on what Catalina can affect your other music software, CDM made an in depth article :
Mac Mini | 10.13 | KA 6 mk1