David - all of my cubase originals are on one disk. I also have the 3.01 version that is on one disk.
The update I got is only 504kb. That would fit on a standard disk wouldn't it? Cant remember a version being over 2 disks on my atari but I may be wrong. Seems odd how the update would be. Have you got 3.1? Is it over two disks?
By the way, if ever anyone else is looking for this update here it is. I havent done anything other than DL it yet so no promises.