I'm trying to downgrade from iTunes 10 to iTunes 8, i uninstalled iTunes 10, got iTunes 8 and installed that one. I'm using Windows 7
First i got the "iTunes library.itl" was created by an ealier version pop up, so i tryed changing the extension but couldn't (i don't know how to do it on windows 7 o something).
Then i changed the name to the iTunes folder in My Music, unstalled iTunes, rebooted pc, reinstalled iTunes 8 and a "The iTunes application could not be opened. A required iTunes componet is not installed. Please repair or reinstalll Quick Time. (-42404)".
Uninstall, reboot, reinstall again, then i moved that "iTunes Libraries" file to my desktop, unsinstalled iTunes, computer rebooted, installed iTunes again and a "The iTunes application could not be opened. A required iTunes componet is not installed. Please repair or reinstalll Quick Time. (-42404)" message came up again.
I don't have the Previous Libraries file, i'm on a new computer and iTunes10 was the first iTunes i got (got iTunes about a month ago), and i guess that since it hasn't have any updates yet that folders doesn't exist. I can't open iTunes because that messages pops up everytime
I'm guessing this is happening because you might have a newer version of QuickTime Player installed.