We are not responsible for poor code and quality of antivirus software vendors, especially noname vendors who are not even bothering responding to false positive reports. Antiviris software industry is in dismal state nowadays, they bring more harm than good. I wouldn't even take them and their 'detections' seriously, they have nothing to do with real security.
The license key is applied on the Viewer side, not Host's. The Viewer is supposed to be 'physically' accessible since it is the administrator's component used to connect in to a remote computer (with Host installed).
1. Completely remove Viewer as described here. 2. Locate and remove the folder C:\ProgramData\Remote Utilities (the PrograData folder may be hidden). 3. Downloadthe latest version of Viewer and install it.