Well Nessus reports "insecure windows service permissions" this is high risk factor (red)
changed permissions:
removed everyone group from FOLDER C:\Program Files (x86)\Lansweeper\services
changed permissions on the EXECUTABLE ONLY (removed everyone)
C:\Program Files (x86)\Lansweeper\IISexpress\IISexpressSVC.exe
*after testing works for me as normal
*after re-scan zero high risks reported