After 9 years and 5 upgrades I have finally upgraded my ancient copy of Photoshop 4 (with 5 upgrade, but since it didn't provide a new serial number only 4 counts) to Photoshop CS3. But it wasn't as simple as you would expect. You see Photoshop CS3 upgrade only allows you to upgrade from Photoshop 7, CS1 or CS2 upgrade or full retail copies. So how was I able to upgrade my ancient copy of Photoshop? Read on and you will find out, and it was 100% legal.