“Can’t verify the signature” install error in Office 2013 or Office 365 Home:

 

To fix this error, try the following methods.

Method 1: Try a wired connection

If you’re using a wireless connection, try connecting your computer through a network cable instead. This may also speed up the download and install process.

Method 2: Clear temporary Internet files

To clear temporary Internet files on Internet Explorer automatically, run fix it.

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