I purchased QuickTime Pro download, but I can t find it on my PC. After opening Quicktime, everything indicates that I do not have "Pro" and that my old version is still intact. I was able to find a registration window and input the activation key, but still nothing. I also tried redownloading it, but nothing. Thanks in advance!!
QuickTime Pro is not a separate application, so you won't find it by searching your system. A Pro key just unlocks the extra features of QuickTime Player and the QuickTime browser plugin. If the Pro labels have gone from the menu items, then your key is correctly registered and you should be good to go.