Download Sierra or El Capitan OS from the App Store Step 2 Click on the Purchases tab, locate macOS Sierra and click the Download button. To create a bootable disk, you need to have the installer app. The installer application gets automatically erased after upgrading the Mac. If you do not have the Install macOS Sierra app in the Applications folder, then you might have already upgraded to macOS Sierra. macOS Sierra installer in Finder Download macOS Sierra Installer Proceed and follow the next steps for creating bootable USB drive. Open the Finder window and navigate to Applications > Install macOS Sierra.
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