How To Update Macos High Sierra 10136 To 1015 Jun 2026

: You need at least 4GB of RAM and 12.5GB of available storage . 2. Essential Preparations macOS Catalina - Technical Specifications - Apple Support

Before any major OS upgrade, use Time Machine to back up your data to an external drive. Updates can fail, and data loss is a real risk. how to update macos high sierra 10136 to 1015