Corrupted Sierra OS

Error message: this copy install macOS application Sierra is damaged and cannot be used to install macOS.

I have

(1) my backup before you download disk

(2) I tried to download and install in normal mode

(3) remove

(4) tried to download and to instill in safe mode

all downloaded files are in its 4.78 GB (is what it supposed to be more?)

I use a stable wi - fi network by downloading and in no time my computer was sleeping

I also tried to install other things (after failing to install the operating system) of the appstore

Error Msg: app _ failed to download. Use of purchases page to try again

I used purchases page to 'try' again - still getting the same error.

Start using 2015 MBP 13 "- have enough space (28GB) for download"

Check your preference in

 > System Preferences > Date and time > set the Date and time automatically

Which can help the server recognize your area for authentication to download installer

Tags: Mac OS & System Software

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