Since Citrix Receiver and Citrix Wokplace are available in the catalog, the extra client component HDX RealTime Media Engine can't be absent.
https://www.citrix.com/downloads/workspace-app/additional-client-software/hdx-realtime-media-engine.html
We will look into this ASAP :)
1 thing to keep in mind I think: the update will not install when an active citrix connection exist (wfica32.exe)
This product has been added in SCUP Catalog Update of 11.08.18