Before upgrading to Catalina, you must ensure your High Sierra installation is fully updated. The version number “10.13.6” is the final build of High Sierra. To verify, go to . If you see a lower version (e.g., 10.13.5), open System Preferences > Software Update and install all available security updates for High Sierra until you reach 10.13.6. This ensures compatibility with the Catalina upgrade mechanism.
If you are using a MacBook, connect it to a power adapter before starting. Step 3: Important Warning About 32-Bit Apps
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Your Mac will restart to begin the installation process. A progress bar and an Apple logo will appear on the screen. The process can take anywhere from 30 minutes to over an hour depending on your hard drive speed. Your screen may go black or restart multiple times; this is completely normal. Do not close the lid or turn off the machine until the login screen appears.
The most critical change in macOS Catalina is the . Catalina exclusively runs 64-bit applications. Before upgrading to Catalina, you must ensure your
Open your web browser and navigate to the official Apple Support page for older macOS versions, or click the direct Mac App Store link for macOS Catalina.
Summary
To check your model, click the Apple icon in the top-left corner of your screen and select . Phase 2: Prepare Your Mac for the Upgrade