i keep getting error in app store while trying to upgrade
i am trying to upgrade my macbook pro from OSX lion 10.7.5 to the OS el capitan so that i can upgrade it to high sierra however every time i try to upgrade to el capitan i get and error message that says i need a software upgrade yet there are no software upgrades how to i get around this so that i can use programs like steam again?....
MacBook Pro with Retina display, Mac OS X (10.7.5)