Thanks for your quik reply,
I made step for step, i deintalled Prepar3D v4.2 Academic Client, installed the v4.3. As you sad just the Client was required. I tried it out and it came as described above.
After a lot of Prepar-Forums search, i tried things that other users discripet. Like deleting the scnery.cfg ... . Prepar3D.cfg ... . Delete generated files... .
How its shown up in the add/remove Program
https://prnt.sc/kk479b