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Fix We can’t verify the signature of files – Office

Fix We can’t verify the signature of files required to install Office product

Because of a problem (created by me) in Office, I had to reinstall Office 2013.
I don’t know why, but I managed to broke the reinstall process.

The error message was: We can’t verify the signature of files required to install Office product

Signature

The logical step was: troubleshooting.

  1. Download a new Office copy from my Office 365 account. – I got the same error.
  2. I’ve cleaned the Temp folder, followed by a system restart. – I got the same error
  3. I’ve used CCleaner to clear the remainings from the registry. – I got the same error

When I was about to give up and install Office 2010, I remembered that the installation is done from the Cloud.
Then I went to step 4 – clear Internet Explorer’s cookies and cache:

  • Internet Explorer: Tools – Internet Explorer – Delete – check Cookies and Temporary Internet Files

Now, Office was able to reinstall successfully

.Office

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