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1. Re: Please help!
Anything older than CC (creative cloud) is a one OS only setup. You will need to contact Adobe and see if you can do some type of an exchange. If you have anything older than CS6, odds are not in your favor, as it would not be supported. I strongly beleive that they will try to sell you on the cloud version.
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2. Re: Please help!
Photoshop CS is no longer being sold by Adobe, so I think cross-grades are not available.
Also the assumption that CS would work on a current Mac OS version seems unrealistic.
But if I understand correctly you should be entitled to use CS2 as the activation server for up to CS2 has been taken offline.
Please read this
http://helpx.adobe.com/x-productkb/policy-pricing/creative-suite-2-activation-end-life.htm l