Over the past few years, I have upgraded Cubase Pro from 8.0 to 8.5 to 9.0 and now to 9.5. Pro 8.0 and 8.5 are still on my computer. Can these be safely removed without trashing everything and doing a fresh install of 9.5?
Yes, they can be removed.
Personally I always leave at least one older version in place in case of any issues or project compatibility problems that don’t show up straight away but you don’t have to.
Uninstall using your OS’s uninstall procedure.
Yes, yes, yes. Plus the actual program doesn’t use a lot of disk space so your not saving much. The content does use some space but it isn’t duplicated between versions. Also you can have two different versions open with different projects at the same time.