I have copied the "loupedeck2.acrf" file into "C:\Program Files\Adobe\Adobe Premiere Pro (Beta)\Plug-ins\ControlSurface " to have it apprearing in the control surface menu, but it still doesn't work.
Please note that the correct location for the Loupedeck plugin is different. The path has changed in Loupedeck software 4.3.3. and it is now C:Program Files\Adobe\Common\Plug-ins on windows\ ControlSurface/
Safest way to get it working is to 1. remove Loupedeck as control surface in Premiere, 2. reinstall the Loupedeck software and 3. set Loupedeck again as control surface in Premiere Preferences/Control Surface.