How To Update Macos High Sierra 10136 To 1015 «DELUXE»

macOS Catalina only runs 64-bit applications. High Sierra can run both. If you rely on older software (e.g., old Adobe CS6, some games, legacy utilities), they will break.

How to check:

Consider finding modern alternatives before upgrading. how to update macos high sierra 10136 to 1015

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. macOS Catalina only runs 64-bit applications

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).

Skipping these steps is the number one cause of failed updates and lost data. Consider finding modern alternatives before upgrading

Your Mac will restart, show a black screen with an Apple logo and progress bar, then restart again (sometimes twice). This is normal.

Total installation time: 1 to 2 hours (depending on drive speed: SSD = ~45 min, HDD = 1.5+ hours).

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