Ensure all important files are backed up, as a clean install will wipe the drive. Boot the Installer: Restart your Mac and hold the Option (⌥)
macOS High Sierra (10.13) was released in 2017. The final, most stable version is 10.13.6 . Apple no longer officially offers it on the App Store for modern Macs, but it remains critical for older Macs that can’t run Mojave or later. macos high sierra 10136 dmg install
This version introduced Metal 2, which significantly improved graphics performance. Ensure all important files are backed up, as