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If the Update option isn’t available or you can’t update, use Microsoft Update to install Office updates via Windows. Try fixing your Office suite if you want to upgrade Office but can’t access any of your Office apps.
Microsoft has issued a warning to Windows 10 customers, stating that recent upgrades have a number of problems. One of the vulnerabilities, according to reports, prohibits users from upgrading Office programs owing to a certificate loss issue.
Here is an example to display how thus error pops up, which says the application was unable to start correctly. Click on the OK button to close the application.