I tried this on CXOffice 4.2, looks like I didn't set up the browser plugin directory correctly (I do a local firefox install, not system-wide). So, installation of Quicktime terminated at the end unsuccessfully.
After setting up the browser plugin directory, I tried running the install, but now, the program will terminate just as the "starting setup" progress bar reaches 100%.
I think this program shouldn't be rated at GOLD just yet, as anything that causes a failed install on the first run will stop it from installing later.