Ensure you’re on the final build of High Sierra (10.13.6) with all security updates.
When the App Store opens to the Catalina page, click the or Download button.
Do not touch power, do not force shut down. If stuck on a progress bar for over 2 hours, then troubleshoot (see Step 6).
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.
Ensure you’re on the final build of High Sierra (10.13.6) with all security updates.
When the App Store opens to the Catalina page, click the or Download button.
Do not touch power, do not force shut down. If stuck on a progress bar for over 2 hours, then troubleshoot (see Step 6).
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.
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