Upgrading from OS X 10.10 Yosemite
I just bought an Used Mac Mini Late 2014 with Yosemite.
I am unable to get OS update from App Store or any free app because it is not accepting my Logon which works fine for I cloud.
I have 2 factors in Apple Id login.
The suggested that I download OS and update via flash drive in a spare Mac...But I do not have another Mac. What should I do?