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Question: I am unable to update the OS

I have a Macbook Air 2015 which has OS el capitan 10.11.6 for the last 2 nights I have been trying to download OS sierra or OS high sierra, so It starts the download very well until the half bar charged suddenly I got a message that says an error has occurred. I tried to restart my computer and do it again but same thing happens. Also I did an update for OS el capitan installed it today but it appears to be available to be download on the App Store.

Help please.

MacBook Air, iOS 10.1.1, Can't update the OS

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User profile for user: paulfromguatemala

Question: I am unable to update the OS