My wife received a new Iphone 6s plus 64 gig for Xmas. Had a problem setting it up from a backup from her older Iphone 3. The backup was made on her desktop computer a older Imac (2008) OS ver 10.7.5; using Itunes version 188.8.131.52. Hooking the phone up to her computer would give a error message that Itunes was not up to date; and to update to the latest version. Her computer states that both her OS and Itunes, are both updated to the latest version! Just wondering what can be done to rectify this situation?