If you're looking for the full retail OS X version of Adobe Photoshop 7 (non-beta), do NOT download any files except the one which is approx. 220MB (.sit)
*** The 345MB file being offered is a fake ***
Other files which are smaller than 220MB in size, are usually beta versions.
The 224MB (.sit) file is complete -- full mac retail version -- and contains a valid serial number.
ALSO: read the warning inside re: Adobe's new "spy" feature. You must disable this feature before you run Photoshop, otherwise, it will send the serial number and your IP address to Adobe, over the net.