Allocate at least (8 GB preferred) and 2 to 4 CPU cores .
Verify that Install macOS Catalina.app is safely located in your /Applications folder. Step 2: Create a Blank Disk Image via Terminal Download Macos Catalina 10.15.7 Iso File --39-LINK--39-
To ensure maximum security and the exact build you want, you can convert the official .app installer into an .iso file using Terminal: Allocate at least (8 GB preferred) and 2 to 4 CPU cores