See if there is an "Activate" option under the help menu. If not, try uninstalling, using the CS Cleaner tool, then reinstalling.Adobe Creative Suite Cleaner Toolhelps resolve installation problems for CS3 thru CS6 and for Creative Cloudhttp://www.adobe.com/support/contact/cscleanertool.html
Me too. I bought mine from a third-party vendor a decade ago, and it worked fine until my HD crashed and I had to reinstall my CS6 Master Collection on a new one. Had to purchase third-part serial number recovery software to do so, and when I input the serial number it turned up for my CS6 MC I was told it was an "invalid number." Turns out Adobe sold batches of SNs to third-party vendors and later decided to invalidate them. Ha ha. I bought it in good faith and Adobe VALIDATED it for over a DECADE until this happened, so as far as I'm concerned it's ADOBE that cheated me, NOT the TP vendor. I WON'T RENT SOFTWARE, so I'm switching to the Affinity graphics products. Goodbye, Adobe.