How To Update Macos High Sierra 10.13.6 To 10.15

Before you begin, there are three critical things you need to know:

Storage:

At least 12.5GB of available space (up to 18.5GB if upgrading from versions earlier than El Capitan). Step 2: Prepare for the Move (The "32-bit Warning") how to update macos high sierra 10.13.6 to 10.15

• If you made a bootable clone: boot from the clone (hold Option at startup) and clone back to internal disk.
• If you used Time Machine: boot to Recovery (Cmd-R at startup) → Restore from Time Machine Backup and follow prompts.

This method erases the hard drive, providing a fresh system free of legacy errors. It requires a USB flash drive (16GB minimum). Before you begin, there are three critical things

Still unsure?

Double-check your specific model at everymac.com or Apple’s official support page. And remember – you can always download the Catalina installer from the App Store, even if Apple technically says your Mac is “vintage.” If you made a bootable clone: boot from

how can I update mac os from High Sierra 10.13.6 version to 10.15?

do not try to force Catalina via patches

If your Mac is stuck on High Sierra because it lacks Metal graphics, (like DosDude1’s patcher). While possible, those patched systems are highly unstable on modern internet services in 2026.