Click the link. This will prompt your browser to launch the Mac App Store app directly. 3. Download the Installer Once the Mac App Store opens on the Catalina page: Click the Get or Download button.
If you downloaded Catalina specifically during the week of October 7, 2019 using a specific Apple ID: macos catalina 1015 19a583 mac app store dow
: Must be running OS X 10.9 Mavericks or later to upgrade directly. Key Considerations macOS Catalina - App Store Click the link
: First macOS version to support 64-bit applications exclusively , completely dropping support for 32-bit software. Download the Installer Once the Mac App Store
The Terminal process will erase the USB drive and copy all necessary installation files. This can take 20-30 minutes. Once complete, you can hold the Option (⌥) key while restarting your Mac, select the USB drive, and boot from it to perform a clean installation.