I have an iMac running Yosemite. I had to reinstall Adobe CS3 suite on a partition because I have some files that I need to keep the older software for, but when I open the program Acrobat Pro after the install, which went OK, it says my serial number is not valid. I also entered the serial number for the previous version of Acrobat Pro, and the serial number for CS2, but still get the same message. All the other programs opened OK and accepted the serial number, and I have reinstalled before on both Snow Leopard and Mavericks with no problem. Any thoughts on the problem would be appreciated. Thanks.
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