For reasons unconnected with Adobe products, I've needed to repartition my hard disc and reinstall the operating system. To reinstate Acrobat Pro X, which I'd purchased previously, I downloaded it again from the Adobe site, and retrieved my serial number via my Adobe account. However, when I installed it, the software alleged that my serial number was invalid. Why? I paid a lot of money for Acrobat Pro. What do I do?
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