What is the latest version of OS X 10 can I use?
I have installed a new optical drive and keyboard. I have also upgraded to a 1 terabyte SSD. I have been trying for a couple days to upgrade the operating system. Unfortunately it will not operate with OS X 10.14 Mojave. What is the latest OS I can use on this machine? Also where can I acquire it? I am now running Snow Leopard