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: hdiutil create -o /tmp/Catalina -size 8500m -volname Catalina -layout SPUD -fs HFS+J

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: If you already have an earlier version of Catalina, you can download the macOS 10.15.7 Combo Update (4.82 GB) directly from Apple Support. 2. Pre-built ISO Downloads : hdiutil create -o /tmp/Catalina -size 8500m -volname