How To Update Macos High Sierra 10.13.6 To 10.15 !!hot!! Jun 2026

: Use Time Machine to back up your Mac before starting.

Use a utility like Go64 to check which of your current apps are 32-bit. You will need to find 64-bit updates or replacements for these before upgrading. Step 3: Back Up Your Data how to update macos high sierra 10.13.6 to 10.15