you have to get GameGuard to work if it shows GameGuard Symbol in your startbar it should work
Try Running the client as an Administrator.
Right click your client :
Under Open there should be "Run as Administrator"
Click it. It should work fine.
or if it dont work try this v
right click trickster client on desktop
then i clicked Behandeln von Kompatibilitäts problemen
^this works for me idk how its called in english x3