Reference 1.1 About macOS SierraHistory of macOSWhat’s New in macOS SierraIntegration Through StandardsReference 1.2 Select an Installation MethodRunning macOS Sierra with No Significant ProblemsRunning macOS Sierra but Has Significant ProblemsNot Running macOS Sierra, but Running OS X Lion 10.7 or Later with No Significant ProblemsNot Running macOS Sierra, but Running OS X Lion 10.7 or Later with Significant ProblemsRunning Mac OS X Snow Leopard 10.6Reference 1.3 Prepare to Upgrade a Previous SystemVerify Installation RequirementsmacOS Sierra Feature RequirementsNewer Mac RequirementsPrepare for an Upgrade InstallationKeep Up to DateReference 1.4 Prepare the System DiskNew macOS InstallationAbout Partitioning OptionsReference 1.5 Upgrade and Install macOSAcquire the macOS InstallerInstall macOS SierraReference 1.6 Troubleshoot Installation IssuesGeneral macOS Installer TroubleshootingAbout the Installer LogExercise 1.1 Prepare a Mac for UpgradeUse System Information to Check Hardware, Firmware, and Application CompatibilityDocument Network SettingsBack Up Your DataExercise 1.2 Upgrade to macOS SierraUse the App Store to Download the InstallerUpgrade Your Computer to macOS SierraExercise 1.3 Erase a Mac System and Install macOS SierraStart Up from Recovery or an Install DiskErase Your Computer’s Disk DriveInstall macOS SierraExercise 1.4 Verify System InstallationExamine the Installer Log