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Upgrading from macOS High Sierra 10.13.6 to macOS Catalina 10.15 is a significant jump that transitions your system from a 32-bit/64-bit hybrid to a strictly 64-bit

First login & optimization

5. Acquisition of macOS Catalina

  1. Migration Assistant: If performing a clean install, use Migration Assistant during setup to restore data from the Time Machine backup created in Section 4.
  2. System Updates: Navigate to System Preferences > Software Update and install any subsequent security patches for Catalina (e.g., macOS 10.15.7 Supplemental Updates).
  3. Application Updates: Open the App Store and update all installed applications to ensure compatibility with the new OS.