Hi everyone I'm trying to upgrade from 10.7.5 to Yos. I get this message: This apple ID has not yet been used with the app store. Please review your account information. OK,so when I review it, it wants my credit card details.If the upgrade is free why do they want that? It wont budge unless I fill in these details which I don't feel is necessary since this is a free upgrade,anyway around this? Thnx.