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Why do I get a warning message regarding certificate error when I’m trying to open Office files. It says: “Certificate error – The application experienced an internal error loading the SSL libraries”.

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This is because your system does not support the newer TLS 1.2 protocol. You need to add a fix on your computer to solve this. Scroll down to “Easy fix” and click “Download”. Read more on this page: https://support.microsoft.com/en-us/help/3140245/update-to-enable-tls-1-1-and-tls-1-2-as-a-default-secure-protocols-in