How To Update Macos High Sierra 10136 To 1015 [exclusive] Jun 2026
Select your main internal storage drive (usually named ). Click Install and enter your administrator password.
This usually indicates a corrupted download or an inaccurate system clock. Go to System Preferences > Date & Time and ensure your Mac is set to set date and time automatically before restarting the download.
Updating your Mac from macOS High Sierra (10.13.6) to macOS Catalina (10.15) is a significant leap that brings a modern interface, enhanced security features, and new apps like Apple Music, Podcasts, and TV. However, because this update changes the system architecture from 32-bit to 64-bit, it requires careful preparation. how to update macos high sierra 10136 to 1015
Upgrading from macOS High Sierra (10.13.6) to macOS Catalina (10.15) is a major leap that transitions your system to a 64-bit-only environment. Use this guide to ensure your hardware is compatible and your data is safe before you proceed. 1. Confirm Hardware Compatibility
Boot into Safe Mode (hold Shift at startup) and clear caches and Time Machine local snapshots: Select your main internal storage drive (usually named )
Your Mac will restart. A black screen with an Apple logo and a progress bar will appear. The installation process usually takes between 30 and 45 minutes. Ensure your laptop remains plugged into power throughout the entire process. Alternative Step: Using macOS Recovery
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. Go to System Preferences > Date & Time
Once the download is complete, the installer will open automatically. Click and follow the on-screen instructions. Agree to the software license terms.