So I had an iPhone 6 Plus and had the latest iOS 9.35 on it. I could sync my music, back up, etc with iTunes 11.4 running on 10.6.8 without problems until my phone had charging problems and I had it replaced by Applecare yesterday. Yesterday I backed up the old phone and made it sync with iTunes 11.4 on this very computer. Now the new phone (exactly the same as my old one) says that that a newer version of itunes is required even though it was this version that created the backup on my computer only yesterday. I'm a Snow leopard holdout and use Soundtrack pro which won't work on the new OS. Any ideas?