I have an old Intel Mac. If I made an appointment for next month when I know that I'll be in a city that has a Mac store, could I pay them to update my Mac OS 10.4.11 to something that I can use with my iPod Touch 4 to transfer apps and music WITHOUT having to buy the disks themselves? Right now, I have to go to the guest room next to mine and use my dad's PC laptop, an I'd rather just stay here in MY room! I never touch the OS on my PCs and Mac, just the stuff I download personally.