Choose your main hard drive (usually "Macintosh HD") and click Install .
If it does not open automatically, open your folder and double-click the file named Install macOS Catalina . Click Continue on the splash screen. Read and Agree to the software license agreement.
Identify essential productivity tools—such as or legacy Adobe Creative Suite packages—that are strictly 32-bit. how to update macos high sierra 10136 to 1015
You may see a folder on your desktop called "Relocated Items." This contains files that were incompatible with Catalina and were moved from your old system.
If your Mac is running slowly on High Sierra, a clean install is better than an upgrade. all files to an external drive. Boot into Recovery Mode (Command + R during restart). Use Disk Utility to erase your Macintosh HD. Choose your main hard drive (usually "Macintosh HD")
If you have a 2012 Mac with a mechanical HDD and critical 32-bit apps, . It's still usable for email, web, and office work, albeit unpatched.
To check apps: Go to .
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Once the download finishes, a window titled will automatically pop up on your screen. Click Continue . Agree to the software license terms.