The 10.15.7 update was primarily designed to resolve specific performance and stability issues: Download macOS Catalina 10.15.7 Update - Apple Support (BY)

On , the Hub’s traffic spiked.

If you are an IT admin or a power user, downloading the Install macOS Catalina.app is useless without a bootable drive. After downloading from the hub:

Apple occasionally removes old installer signatures for security. If the download fails with "Installation requires downloading important content," change your system date to October 15, 2020 via Terminal ( date 1015000020 ) before running the installer.