One option is to download it from the net, and use your original CD-key.
Atleast here, it's allowed to do like that, since it's effectivly the same software, that you own, and need a uniqe key to activate, that you own, and the key would not work for other versions then it was intended to do.
But as for downloading it, and use a cracked/serial-generator, that is granting you a free bullet to the back of your head.
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Meh....
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