Updating OSX on 2012 MacBook Air
My uncle asked for some help setting up a new iPhone XsMax he got as a gift. He wanted me to back it up with his MacBook Air that I got him in 2012 or ‘13. I don’t think the OS has been updated since he got it. I tried to upgrade to Mojave through the App Store. iCloud attempts to do verification through his current iPhone 7plus, with the verification code popping up. However there is nowhere to input the verification code on the laptop. Just space for username and password. Just wanted to see if there are any solutions for this issue. Thank you!