During my last sync, I got this message: "A new version (4.3.5) is available for the iPad. Would you like to download it and update your iPad now?" I selected "Download and Install" and got this message: "There are rentals on the iPad. You should transfer these movies to your iTunes Library before updating this iPad. Are you sure you want to continue?" I've researched this and cannot find how to do it. [In fact, all that I've read says that you CANNOT transfer rentals.] Can anyone help?