There are 2 primary ways to upgrade the Veeam Backup Agent: Discovery rules or manually.
Updating with Discovery Rules
To update Veeam backup agents installed with a discovery rule:
Log in to Veeam Service Provider Console. In the menu on the left, click Discovery, then open the Discovered Backup Agents tab. Select one or more Veeam backup agents in the list. At the top of the list, click Backup Agent and choose Update.
After you initiate the update procedure, the value in the Backup Agent Version column will change to Updating. You can click the Updating link to track the progress of the update procedure. After the update procedure completes, the value in the Version column will be set to Up-to-date.
In some cases, after update you might need to perform additional operations. For example, if the setup detects a pending computer reboot, the Backup Agent Version column will display a warning notifying that reboot is required.
Updating Veeam Backup Agents Installed Manually
In the master agent settings, specify credentials of an account that will be used to upload the setup file to client computers. Log on to a computer that hosts the master agent. In the icon tray, right-click the master agent icon and choose Agent Settings.
In the Veeam Master Agent Settings window, click the Remote computer discovery user account link, then select the Specify local administrator credentials for remote installation of backup agents check box. In the Username and Password fields, specify credentials of an account that will be used to upload the Veeam backup agent setup file to client computers. Click OK to save these settings.
NOTE: The account must have local Administrator permissions on all computers in the update scope — that is, computers that run Veeam backup agents that must be updated.
In VSPC, select Discovery and open the Discovered Backup Agents tab. Select one or more Veeam backup agents in the list, select Backup Agent, and choose Update. Track the procedure’s progress as above.