Hi CubeDAW,
please have a look here: Steinberg Forums
In addition to that, in Cubase 8 the " Steinberg Installation Updater" (SIU) was introduced, which basically looks online for the latest Cubase version available and installs it when running the original installer.
So to make things easier, you should just uninstall Cubase 8 via the Windows Control Panel / Programs and Features, and run your original installation package again. You will end up with a Cubase Pro 8.0.10 automaticaly.
Hope this helps