Download Macos Catalina 10157 Dmg File Install !full!

Insert a 16GB+ USB drive. Format it as Mac OS Extended (Journaled) with GUID Partition Map. Name it MyVolume .

: Once finished, the file "Install macOS Catalina" will be in your Applications folder. download macos catalina 10157 dmg file install

Use Disk Utility to format it as Mac OS Extended (Journaled) named "MyVolume". Insert a 16GB+ USB drive