How To Update Macos High Sierra 10136 To 1015 Link

Apple no longer prominently features Catalina on the App Store because newer OS versions exist. Here’s how to find it.

Once the installer is downloaded (it’s about 8 GB), follow these steps.

Important: Do not interrupt power or close the lid on a laptop. how to update macos high sierra 10136 to 1015

  • Follow the on-screen prompts:
  • Authenticate: Enter your administrator password.
  • The upgrade begins: Your Mac will restart, show a progress bar, and may restart two or three times. The screen may go black or show an Apple logo with a timer. This is normal.

    • During restarts: Do not touch power, do not force shut down. If stuck on a progress bar for over 2 hours, then troubleshoot (see Step 6).

    Since macOS Catalina is an older version (preceding Big Sur, Monterey, Ventura, and Sonoma), it is located in the "Older Versions" section of the App Store. Apple no longer prominently features Catalina on the

  • Once the download completes, the Install macOS Catalina app will open automatically.
  • Click Continue and follow the on-screen instructions.
  • Agree to the software license terms.
  • Select your current startup disk (usually "Macintosh HD") and click Install.

    • Fix: Change system date temporarily via Terminal:

    Go to System Preferences > Time Machine > turn on "Back Up Automatically." Do a manual backup (right-click the Time Machine menu bar icon > "Back Up Now"). Follow the on-screen prompts:

    The most significant change between High Sierra and Catalina is the end of support for 32-bit applications.

  • Alternatively, get it from Apple’s support page for older macOS.