Contact Adobe for your version of Creative Suite 5, if you can send them screenshots of purchased disks, serial or 'something' vaguely concrete, you can download the disk image, and they will give you a license, providing everything is legitimate. I'm in a similar situation after a Mac restore, but I'd prefer NOT to WASTE another of my 3 installations, leaving only one, just because Apple and Adobe don't bother to inform you that you will lose licensing for most software if you back-up though the semi-unless Time Machine or Migration 'Assistant'. I've ostensibly lost All OF creative Suite, and I use Photoshop everyday, and there different installations/ versions of Lightroom, containing around 16,000 image files. I 've had this issue for a month, and the Apple Tech guys remotely accessing my screen to 'help', same with Adobe, except Adobe DO ACTUALLY take control, whereas Apple just use the pointer, and give you 'instructions, when, in reality, they know that resistance is futile. I just wish I new Time Machine was such Pants!