Make sure that:

  1. The dongle has a supported Realtek chipset
  2. That the drive for the chipset is installed.

There are a few drives for Realtek chipsets and are available to download from the Applications->Plug-ins section of the GUI. Make sure to click the green update button to populate all of the packages. The ones that should be installed with the 3.202 firmware are kmod-8811au, kmod-8812au but depending on the actual chipset, there might or might not be a driver available which is what I’m currently dealing with.