Summary: If you have a new Mac or Windows computer and you want to transfer your iOS purchases from your iPad or iPhone to iTunes on your new computer, you will need to authorize you new Mac or Windows PC first. This is a quick tip on how to authorize and transfer your purchases to your new computer. To authorize on your Mac: Connect your iPad (or iOS device) to your Mac Open iTunes Click on Store in the top menu bar Click 'Authorize This Computer' Log in with your Apple ID To transfer purchases from your iPad to your Mac: With your device still connected to your Mac right click on your iPad (or iOS device) in the left menu under 'Devices' Click on 'Transfer Purchases from 'device name' For more information you can visit Apple.com for a more thorough explanation.