Ummm, this is a user forum - we can’t do that for you. You need to work with whoever sold Cubase to you (music store, Nexway AG - aka the online store). Pretty sure that you’d want to contact Steinberg and not Yamaha (who aren’t involved in the day-to-day management of their subsidiaries like Steinberg, Line6, Ampeg, etc.)
However it does seem odd that Cubase won’t run on your computer - any details as to why?