Please confirm you are running version 22.214.171.1248, 126.96.36.19901, 188.8.131.5254 or 184.108.40.20601 prior to installing this update. You can check this under Help | About
in Veeam ONE console. After upgrading, your build will be version 220.127.116.1166.
This update should be applied to the Veeam ONE server, as well as remote systems with the Veeam ONE Monitor Client.
Before you apply the update, make sure you have a full backup of Veeam ONE database (how to backup Veeam ONE database