An FYI for anyone installing Virtualbox, either on a HostOS or as a Guest...

Version released yesterday (6.1.16) now is supposed to support kernel 5.9 fully, so you shouldn't have problems running TW either as a Guest or on a HostOS.

New VBox rleeases are not usually available immediately as pre-compiled in packages from openSUSE immediately, so wait a bit.
But, if you are in a hurry, you can try installing from the downloads from the Oracle Virtualbox website.