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sudo hdiutil create -o "macOS 10.15.7 Catalina" -size 16122112b -layout SPUD -fs HFS+J -TYPE SPARSE
sudo hdiutil attach macOS\ 10.15.7\ Catalina.sparseimage -noverify
sudo diskutil unmount Install\ macOS\ Catalina/
sudo hdiutil detach Install\ macOS\ Catalina/
sudo hdiutil convert macOS\ 10.15.7\ Catalina.sparseimage -format UDZO -O "macOS Catalina 10.15.7 (19H15).dmg"
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