Can a Cubase 9.5 install be “upgraded” to 10? Or is a full reinstall necessary?
Thanks,
Todd
If applicable you purchase the upgrade but, you need to download and run the full installer as this is a new version. Not an upgrade or update. 
Regards 
I think it would be cool if there is an option when installing to just update your existing version. They ought to consider this in future releases - even if it’s a major release, this would be a nice option.
It’s not an update though, they are completely new executable files. That’s why it sits in a different directory.
What would be useful (for those with slow internet connections for example) is the option of not re-downloading the various instrument libraries where they overlap as these are generally kept in common areas. Then again I can see this might also bring issues so I understand why a full install is far safer.