Apple has discontinued QuickTime. They will not be patching it. You should be able to uninstall QuickTime from your computer. MasterCook will continue to function. You just won't be able to view the videos that require QuickTime. The videos are stored here on your computer:
C:\Users\Public\Documents\MasterCook 15\Video Tips
You can search online for a video convert that converts .mov files into another format. Then you can do that and view the new video format. Our developers will be looking into options to address the issue for MasterCook.