My Cubase Elements 6 Full Version doesn’t work anywore on my macOS High Sierra 10.13.6
Can I update it even if it’s not instalei anymore?
If you have a valid license stored on a working USB dongle then yes you can update that without the need to install the CB Elements 6.
If the license is stored on a Soft-eLicense (on the computer) then you can follow the process for Reactivation that I linked to below. Open your eLicense Control Center to see if a valid license shows up and where it is stored (either on a usb dongle or Soft-eLicense).
Regards