My dad has a macbook, and i have a pc. He used my pc to update when his itunes wouldnt update...?

So now he has to hook his iphone up to my computer every time that he wants to sync his phone, and is getting angry because he no longer has all of his music or his playlists. Apple has said that he needs to update his operating system to update itunes on his macbook, but he doesnt want to get "scammed" into upgrading. Is there any way to simply revert back to a firmware compatible with his version of itunes? Transferring his entire library will take forever (1200+ songs and movies) so i would much rather get his iphone to work with his macbook again. Thanks.