If you need to install Catalina on a different Mac or perform a "clean install," you must convert the app you downloaded into a bootable drive. How To Create A Bootable MacOS Catalina Install Drive
The most reliable way is to use a direct link that forces the App Store to open the Catalina page. macOS Catalina on the App Store descargar macos catalina 10.15 dmg
. However, Apple does provide DMG files for specific incremental updates (like the 10.15.7 Combo Update). Official Download Methods Mac App Store If you need to install Catalina on a