I have gone to my modules folder and there is lots in there. It says I need to do the registration at install. I do that and both boxes immediately disappear. When I go to P3D and select the FUSIPC add on its says I'm not registered. A box pops up that says registration accepted then offers a flickable box to confirm. I enter my registration info and Key exactly as show on my order confirmation. I install the downloaded exe file as administrator. I have P3Dv4.1 installed and have been playing it. I have been reading the forums and haven't found a problem like this.