You upgrade all vSphere Replication components of vCloud Availability by using a pre-downloaded ISO image.
The downloadable ISO image is the only available method of upgrading the vCloud Availability vSphere Replication components to version 126.96.36.199.
You cannot downgrade to an earlier version of vSphere Replication.
You must upgrade the vSphere Replication components of the vCloud Availability solution in the following order.
Upgrade the vSphere Replication Cloud Service hosts.
Upgrade thevSphere Replication Manager instances.
Upgrade the vSphere Replication Server instances.