Due to various known vulnerabilities in QuickTime for Windows, Apple made the choice to end support for their product on April 14, 2016. While QuickTime is still available for download from Apple, the program itself is no longer being updated or supported.
The main basis of the render engine for ProPresenter 4 and ProPresenter 5 is built around QuickTime, thus you will need to keep QuickTime installed on your machine for ProPresenter to work properly. If you are using ProPresenter 6 then you no longer need QuickTime. We rebuilt our render engine to be fully self-contained and not rely on third-party software like QuickTime.
ProPresenter 4 and ProPresenter 5 may not work properly without QuickTime being installed on your computer. Both of these versions will still be able to play WMV or MPEG videos, but they will not be able to play QuickTime files (MOV or MP4). If you want to uninstall QuickTime, you can replace it with the free QuickTime Alternative. Click here to go directly to the download page for QuickTime Alternative. You will want to use the first link to download QuickTime Alternative 3.2.2. You may see some warnings or alerts about the download, but codecs.com is a safe site. Click through the installer until you get to the Select Components screen. You do not need to check the box for Media Player Classic. The default Normal option will work. Click through the remaining screens without changing anything. After QuickTime Alternative is installed click Finish on the final screen. You should now be able to use QuickTime videos in ProPresenter 4 and ProPresenter 5.This has only been verified to work with Windows 7. If you are using Windows 8.1 or Windows 10, we recommend keeping QuickTime or upgrading to ProPresenter 6.
Keep in mind that many other programs such as After Effects for Windows also rely on QuickTime to run correctly. If you choose to uninstall QuickTime, verify that you aren't running any programs that need it to be installed to work correctly.
If you want to uninstall QuickTime here is the link to Apple's official instructions.