My Mid 2012 13" MBP has Yosemite 10.9.5 and I wanted to upgrade to El Capitan so I can use a new Magic Mouse 2. When I clicked the link to upgrade to El Capitan it says it cannot upgrade this computer. I'm seeing the App store shows High Sierra as "installed" but it's definitely not. The High Sierra installer app is located in my applications folder but it never proceeded with the install. Is there a way to delete the High Sierra Installer App and somehow get this machine upgraded to El Capitan? I do not want High Sierra, just El Capitan....