I'm using Acrobat as part of CS4. It was a gift from a fellow creative friend. The install worked back in 2009 on my previous Mac. For some reason, the serial number no longer works when I go to run Acrobat. It's been rejecting the serial number on the CS4 package for months, now.
Help? I hardly use the software (I've a toddler) but I do need Acrobat's functionality once in a while. Thanks in advance!