Unmount the image and move it to your desktop as a completed DMG file:
If you are coming from an older OS (like Mojave), Catalina also introduced: How to download and install macOS - Apple Support
A bootable external drive is highly recommended for clean installations, troubleshooting, or deploying Catalina across multiple machines without re-downloading the asset. download macos catalina 10157 dmg file install
Select your newly formatted internal storage drive () as the target destination. Click Install .
Select your primary internal drive (usually labeled Macintosh HD ) as the target destination. Unmount the image and move it to your
Yes, Apple still hosts the installation files on its content delivery network. As long as you download from an official source, the installer will pass Gatekeeper checks.
Insert your newly created bootable USB drive into a functional port. Insert your newly created bootable USB drive into
As the percentage crept to 99%, the power in the apartment flickered. The Mac Pro groaned, its fans spinning like a prop plane taking off. Then, silence. The screen stayed dark for a heartbeat before a single, silver apple appeared. The ghost was back. The installer didn't just bring the hardware to life; it breathed air into a story that had been frozen in silicon for years. once your download finishes? Apple macOS Catalina (10.15.7) - Internet Archive