Find the download in "Applications" and double click to initiate the upgrade. I didn't even have an "install" option available to me after the download from the app store was complete.Help! It downloaded, I clicked to install, it said it needed to close apps, then it rebooted, and then said it shut down due to problems. Now its rebooted but in the App store it just says its downloaded, I can't see any way of installing it again?
iMac 5K 27" fully maxed out.
What do I do now?