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Unfortunately, the way to do a re-install most efficiently is to de-license your old version first, before you trash it (for future reference, the button to initiate a de-license is in Game Preferences). This basically releases your activation code at the PISD server.
You should have been given two activation codes when you bought the game. Have you tried both of them?
PISD will release your license(s) upon request, but you have to go their web site and sign on to your account there. It happens pretty automatically (though you will get a little nagging message about taking care of your licenses).
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