HT3678: Installing QuickTime Player 7Learn about Installing QuickTime Player 7
Currently Being ModeratedOct 20, 2012 1:48 PM (in response to Mac144Lover)
In Mountain Lion, you must relaunch quicktime after entering your serial number before the pro features become available.
If it works, then that's one way. Though all you should have to do after entering the serial number is press Enter rather than tab.