How To Update Macos High Sierra 10136 To 1015
Bridging the Gap: Updating from macOS High Sierra 10.13.6 to macOS Catalina 10.15
The evolution of Apple’s macOS is marked by significant interface and architectural changes. For users still running macOS High Sierra (version 10.13.6), the leap to macOS Catalina (version 10.15) is not a minor patch but a substantial upgrade. While High Sierra refined the file system and focused on stability, Catalina fundamentally altered the operating system by removing legacy support and introducing new core applications. However, before beginning the update process, users must recognize that this transition requires careful preparation, compatibility checks, and an understanding of what will be lost.
- Delete old downloads, trash, and large unused apps.
- Use About This Mac → Storage → Manage to offload files to iCloud or delete old iOS backups.
Phase 2: Downloading macOS Catalina from High Sierra
Apple no longer prominently features Catalina on the App Store (it now promotes newer OS versions), but the direct link still works. how to update macos high sierra 10136 to 1015
Step 3: Backing Up – A Non-Negotiable Step
Transitioning from 10.13 to 10.15 changes system files, user permissions, and the underlying disk structure. A failed update can result in data loss. Therefore, you must perform a full Time Machine backup to an external drive. For additional safety, consider cloning your startup disk using software like Carbon Copy Cloner. Crucially, do not skip this step; Catalina converts the system volume to a cryptographically signed, read-only “Signed System Volume,” and while this usually works seamlessly, reverting is difficult without a backup. Bridging the Gap: Updating from macOS High Sierra 10
- Click Continue.
- Agree to the software license agreement.
- Select your startup disk (usually “Macintosh HD”).