Apple hides older macOS versions in the App Store, but you can grab them via direct links.
Here is your comprehensive guide to downloading and preparing macOS Catalina 10.15.7. 1. The Official Way: Using the Mac App Store download macos catalina 10157 dmg file better
to download the official installer and modify it to run on older hardware. Quick Download Summary Apple App Store Full Installer Clean installs/Upgrades on Mac Apple Support Combo Update Updating from 10.15.x to 10.15.7 GitHub/Archive DMG/ISO/Torrent Virtual machines or slow connections Before starting, ensure you have backed up your data Apple hides older macOS versions in the App