: Sometimes, direct download links for macOS updates are shared, but these links might not always be secure or up-to-date. Also, directly downloading a DMG file of an operating system update isn't a standard or recommended practice due to potential security risks.
If you already have Catalina and just need the 10.15.7 update files, you can download them directly as DMG files from Apple Support: macOS Catalina 10.15.7 Combo Update mac os catalina 1015 7 dmg download free
Yes. Apple never charges for macOS updates or upgrades. : Sometimes, direct download links for macOS updates
Fixes an issue that could prevent files syncing through iCloud Drive. Apple never charges for macOS updates or upgrades
This is common with old installers. Disconnect from the internet, open Terminal, and set the date back to 2020: date 0101010120 App Store not working:
This downloads the official installer to your /Applications folder. No DMG is created yet—but now you have the genuine .app file.