I just installed Illustrator CS4 TRIAL and it is stating that trial has expired and is asking for a serial number. I literally only downloaded this about an hour ago.
Does anyone have any ideas what is up with that?
You had another trial (of another product) and let it time out, locking the licensing system or another existing Adobe product is preventing the trial from running. Nothing you can do about it, unless you feel like wiping your computer and reinstalling your operating system from scratch plus al lthe software.