sage peachtree pro accounting 11

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I purchased a new sage peachtree pro accounting 11 software program on ebay.  I installed it on a windows 7 computer and it worked fine until I ran out of uses.  Now it says I have to register, but when I called sage, they wouldn't register it even though I had the serial number.  There excuse was that they no longer support their program even though I am not looking for their support, just a registration ket to be able to run the program.  Is there any way to work around this problem?