I've never needed any VE Pro license on the eLicenser plugged in my Host machine, as I'm running both VE Pro Server and any other VI / VI Pro plugin instance in the remote servers. In fact, I could run both the VE Pro setup and the VE Pro plugin inside my host software without any VE Pro license in my eLicenser key.
Now, I've just noticed that you need a VE Pro license in the eLicenser also during the setup. I think this is just an error in the setup executable, as it never happened before. In fact, I installed any previous version of the VE Pro on my Host without any VE Pro license.
I can also confirm that, once the new VE Pro 6853 is installed, you can remove the eLicenser and the plugin inside your host loads without any issues, as it did before.
This makes my think that something went wrong compiling the setup executable of the last VE Pro release 6853.