Please confirm you are running Veeam Management Pack 8.0 prior to installing this update. You can check this in Operations Manager console under Administration | Management Packs, the build number should be 220.127.116.118 or later.
To install the update, import the management packs through Operations Manager console > Administration > Management Packs > Import Management Packs.
After upgrade, the version of Management Packs will be 18.104.22.1682.
To obtain Veeam MP 8.0 for System Center - Update 3, please download it here