Sometime ago I found a copy of Photoshop 5.5 (both the APPLICATION and TRAINING) CD's in trash. I finally am getting around to try to use this, but I do not have a serial number. I have the original CD's, not illegal copies - how can I get serial numbers to use to get this program working?
Sorry to say you are out of luck.
The serial numbers came on the cd case. If they are no longer there, you have no way of using the program except as a 30 day trial. Adobe does not sell CS5 licenses any more.
You don't. The serial number is on the box/packaging it came in. Without that box the program is useless.