Before starting, verify that your Mac is officially supported. You can check your model by clicking the > About This Mac . Catalina-Compatible Mac Models: MacBook : Early 2015 or newer MacBook Air : Mid 2012 or newer MacBook Pro : Mid 2012 or newer Mac mini : Late 2012 or newer iMac : Late 2012 or newer iMac Pro : 2017 Mac Pro : Late 2013 or newer 2. Prepare for the Upgrade
Summary
If you're having trouble updating directly, you can try using macOS Recovery: how to update macos high sierra 10136 to 1015
Finally, the download finished, and the macOS Catalina Installer window popped up automatically. It asked him to choose a disk to install. He selected his Macintosh HD. Before starting, verify that your Mac is officially
He clicked the Apple logo in the top-left corner, navigating to "About This Mac." The window confirmed his fears. He was stuck on 10.13.6, and he needed to get to macOS Catalina (10.15). Prepare for the Upgrade Summary If you're having
Catalina needs to download and install. More is better (30-40 GB recommended).