To upgrade your Site Recovery Manager 8.3.x for Windows instance to Site Recovery Manager 8.5, you must first migrate your Site Recovery Manager 8.3.x instance from Windows to the Site Recovery Manager 8.3.x Virtual Appliance.
To upgrade your Site Recovery Manager 8.3.x for Windows instance to Site Recovery Manager 8.5, you must first migrate your Site Recovery Manager 8.3.x instance from Windows to the Site Recovery Manager 8.3.x Virtual Appliance.