Download+macos+high+sierra+10136+dmg+mac+install Better

Troubleshooting

Expired certificate. Apple stopped signing High Sierra in 2020. Fix: Open Terminal and set the date back during installation: download+macos+high+sierra+10136+dmg+mac+install

Apple provides a direct link to the macOS High Sierra App Store page . Note that if your current Mac is running a significantly newer version (like Ventura or Sonoma), the "Get" button may be greyed out. Troubleshooting Expired certificate