So I’m looking to upgrade to the latest version of Cubase and as far as I understand, an update would be for example, from Cubase 6 to 6.5, and an upgrade would be from Cubase 6 to 8. However on the Steinberg website it gives me the option of an UPDATE from Cubase 4 to 10.5. Can anyone clarify what the difference is between the update and upgrade? Thanks 
UPDATE is within the same version range. I.e. from „Elements x“ to „Elements y“, „Artist x“ to „Artist y“ and so on.
UPGRADE is from a lower version to a higher version. I.e. from „Elements“ to „Artist“ or „Pro“, or from „Studio“ or „Artist“ to „Pro“.
Thank you!