If you have access to a Mac, search for "macOS Catalina" in the App Store to download it directly from Apple.
Close Disk Utility and select Install macOS from the main menu. Follow the on-screen instructions, selecting your freshly erased drive as the destination. Alternative: Direct DMG Download (For Virtual Machines) If you have access to a Mac, search
Despite the release of newer, more advanced macOS versions, remains a popular, stable, and necessary operating system for many users. Whether you are reviving an older Mac, running legacy software (specifically 32-bit apps), or need a fresh start, a clean installation is often the best solution. Do not download DMG files from unknown third-party
Downloading from the official source is crucial for security. Do not download DMG files from unknown third-party websites, as they may contain malware. Once in the Recovery menu
Open Disk Utility , select your USB drive, and format it as Mac OS Extended (Journaled) with a GUID Partition Map . Name it Catalina .
Once in the Recovery menu, select Disk Utility . Select your internal hard drive (usually named Macintosh HD ) and click Erase . Format: APFS Scheme: GUID Partition Map
To perform a clean installation, you cannot run the installer while running the system you want to delete. You need a bootable USB drive (at least 16GB).