Opening the DMG does not immediately start the OS installation. It only installs the "installer app" to your Applications folder. Double-click InstallMacOSX.dmg to mount the disk image. Double-click the InstallMacOSX.pkg file inside the window.
Improvements in app launching and PDF rendering via Metal. Mac Os X El Capitan 10.11.6 Installer Dmg Download
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When Apple released OS X 10.11 El Capitan in September 2015, it was marketed as a "stability and performance" release. After the ambitious but buggy rollout of Yosemite (10.10), users needed a balm. They got it. Opening the DMG does not immediately start the