You are not able to install the Unified Agent Local Enforcement (UA) client that is associated with a ProxySG. This article does not apply to the UA client used to connect to Web Security Service (WSS).

Installing the Unified Agent client returns the following error message: "Existing product not found. Upgrade cannot be completed"

To Install UA:

• You must use the following syntax:
  bcua64-setup.msi CM_URL=https://x.x.x.x:8084/proxyclient/ProxyClientConfig.xml SUP=123456
• CM_URL= is used to define the ProxySG appliance acting as the Client Manager.
• SUP= is used to define an optional tamper resistance password.