Please confirm that you are running one of the following versions of Veeam Backup for Microsoft Office 365 before upgrading to 5.0:
You can check this under Help and Support > About in the Veeam Backup for Microsoft Office 365 console. To upgrade from earlier versions, please contact our Customer Support. After upgrading, your build number will change to 5.0.0.1063.
Please refer to the What’s New and Release Notes documents for detailed information about this release.
Before you apply this update, be sure to review the ‘Upgrading Veeam Backup for Microsoft Office 365’ section of the Release Notes document.