Select your current startup drive as the installation target. macos high sierra 10136 dmg install
Open and look at the left sidebar to find the name of your USB drive.
sudo trimforce enable
Once the bootable USB is ready (or if you are running the app directly from /Applications ): Shut down your Mac. Plug in the bootable USB drive. Turn on the Mac while holding down the Option (Alt) ⌈left ceiling key.
Double-click the Install macOS High Sierra.app or mount your custom DMG file directly inside your current desktop user account. Follow the on-screen installation wizard. Select your current startup drive as the installation target
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/HighSierraUSB Use code with caution. Press .
iBoysoft DiskGeeker is a third-party utility that can download the official macOS High Sierra DMG directly from Apple‘s servers. This is especially useful if the App Store method gives you a compatibility error on a newer Mac. Plug in the bootable USB drive