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Vmmac double-click display can't check for updates.
1. First click the Launchpad icon in the Dock, type "Terminal" in the search field, and then click "Terminal".

2. Secondly, enter the command: software update-fetch-full-installer-full-installer-version 1 1.7.

3. Finally, enter the version to be updated instead of the full installer version 1 1.7.