If the App Store link isn't working, you can pull the installer directly from Apple's servers using a Terminal command (available on macOS Mojave and later). Open (Command + Space, type "Terminal").
It introduced the ability to use an iPad as a second monitor. download catalina 10.15
Open and paste this command: sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume Enter your admin password and press Y to confirm. If the App Store link isn't working, you
Apple keeps a hidden link for Catalina on the App Store. Searching for it directly in the store often yields no results, but you can access it through the official support channel. If you plan to perform a clean install
If you plan to perform a clean install or update multiple Macs, creating a bootable USB is the most efficient route. Plug in a USB drive (at least 16GB). Rename the drive to MyVolume .
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Once finished, the file "Install macOS Catalina" will be in your folder. 2. Using the Terminal