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Hi there, As far I understand, If you install more than one copy of adobe product The serial will lock at Adobe home server. You can try to contact adobe here and tell them about the problem : http://www.adobe.com/support/photoshop/
If you want to upgrade to CS3, you will need the registration key to do so. If you don't have it, you will have to buy CS3. The upgrade package will require your registration key for CS2 to complete the installation.
The point of an upgrade edition of a piece of software is so that you can upgrade your existing software. You need Photoshop 7 or higher to use the upgrade. If you don't have it, you will need to return/refund your purchase of the cs3 upgrade, and get the full version of the software instead.
Your other option is to purchase an earlier version of adobe photoshop, in order to install it so that you can upgrade it. Seems very round-about but I suppose it would work, and I'll bet if you find adobe photoshop 7 somewhere, it'll be awfully cheap ;)
Unfortunately the "official" word is out. Photoshop 7.0, 7.0.1 is not compatible with Apple's newest Operating System, Leopard (10.5).
Adobe Photoshop versions CS (8.0) CS2 (9.0) and CS3 (10.0) do run in Leopard but may have some issues. The only suggestion I have for you is either revert back to Tiger (10,4) or upgrade your Photoshop to CS3.
Adobe offers a discounted upgrade price from 7.0, CS1, CS2 to CS3 for $199. That's a lot
better then paying the full retail price of $649.00. I wish I had a better suggested solution for you. You're not alone on this one.