Veeam backup & replication requires to be updated each time that a new version or patch is released.
I am taking note, on blog, a minimal checklist/workflow:
- Disable job backups
 - Download latest Veeam B&R version https://my.veeam.com/my-products
 - Verify, using 7zip (right click on file --> 7zip --> md5 )
 - At least 40 GB. are required on Veeam VM.
 - Turn off VM
 - Snapshot
 - Turn on VM
 - Disable Antivirus
 - Mount iso and start installation
 - Prerequisite check will start (select any checkbox proposed)
 - Most probably a server reboot would be necessary.
 - Restart VM
 - Mount iso and start upgrade process once again.
 - Re-enable Antivirus
 - Execute Veeam
 - Rescan vCenter server and rescan backups repository
 - Re-enable Veeam backups.
 - Execute Veeam configuration backup
 - Delete snapshot
 
Here they are other Veeam blog articles