If the App Store link fails, Apple’s command line tool is the most reliable fallback.
Acquiring macOS Catalina 10.15.7 requires utilizing direct links or terminal commands due to its removal from the public App Store front-end. By utilizing the softwareupdate tool or direct App Store links, administrators can successfully obtain the full 8.1 GB installer for legacy hardware maintenance. It is recommended to create a bootable USB installer for redundancy and easier deployment across multiple legacy devices. download catalina 10.15.7 full installer
The installer will be saved to the /Applications folder. If the App Store link fails, Apple’s command
Paste the following command and hit Enter: softwareupdate --fetch-full-installer --full-installer-version 10.15.7 If the App Store link fails