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I am trying to update to macOS High Sierra. but it gives me following error:

Error image

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  • I think the installer is the incomplete one downloaded previously. To start isolating the problem, can you connect to the app store? Try searching for updates
    – claudio
    Jan 25, 2019 at 11:49

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I have recieved this error in the past, make sure the time and date on your computer are correct.

You can do this by going into "System Preferences" > "Time and date"

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