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Mac App Store: "An unknown error occurred (100)" when purchasing

Discussion in 'Mac & OS X' started by Alex Dmitri, Feb 14, 2017.

  1. Alex Dmitri

    Staff Member Super Admin Contributor

    Feb 6, 2017
    Likes Received:
    When attempting to purchase an app, an alert might appear indicating the app couldn't be purchased, as well as "An unknown error occurred (100)".

    Try the following steps to workaround this issue:

    1. Quit App Store.
    2. Wait 10 seconds or more.
    3. Open App Store again.
    4. Navigate to the desired app.
    5. Click Buy.
    If the issue persists, try restarting your computer and attempting the app purchase again.