Troubleshooting steps for playing iTunes videos in classrooms.
Download the SD version.
Although HD is usually downloaded first, the individual should be able to look back at their purchase history and download the SD version. Instructions on accessing your purchase history: support.apple.com/kb/HT2727 Similarly, a DVD-ripped copy will also be playable.
Purchase an HD Fury dongle, this piece of equipment will convert a digital signal into analog (HDMI to VGA) and allow the video to play. It simply needs to be connected between the computer and the video cable. www.hdfury.com/