Ensure you have all 10.13.6 supplementary updates:
Before you spend an hour preparing, let’s ensure your hardware supports macOS Catalina. Apple dropped support for many older Macs in 10.15.
If you are using a MacBook, MacBook Air, or MacBook Pro, ensure it is plugged into a reliable power outlet. Never attempt a macOS upgrade on battery power alone. Step 3: The 32-Bit App Warning (Crucial for Catalina) how to update macos high sierra 10.13.6 to 10.15
Catalina runs .
The App Store app will automatically launch on your Mac, displaying the macOS Catalina page. Click the or Download button. Ensure you have all 10
The screen may go black for a few minutes, and the progress bar might appear to stall. This is normal.
Beyond hardware, you also need to check your system resources. Your Mac must be running (which it is, as you're on High Sierra), have at least 4GB of RAM , and possess at least 12.5GB of available storage space . For the safest installation, it's recommended to have 15GB to 20GB of free space to accommodate the download, installation, and post-update file management. Never attempt a macOS upgrade on battery power alone
After the final reboot, you’ll see the Catalina setup assistant.
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