This popped up in a thread recently and I couldn't remember the exact product I used when MediaComposer | First complained that I didn't have QuickTime installed. I'm on Windows 10 64bit which makes an Apple provided old version impossible since they do not officially support Win10 or 64bit. So far it has been working fine for me, and should not have the security flaws that the older Apple version currently has.
Search for QT Lite 4.1.0 there are newer versions, but it looks like the project may be going in a different direction by providing an application development IDE.
Search for QT Lite 4.1.0 there are newer versions, but it looks like the project may be going in a different direction by providing an application development IDE.