Thanks your for quick reply and concern.
I played Panzer General hundreds of hours and was so happy to find this wonderful remake.

I googled little more and found useful advices.
1. Uninstalled game again.
2. Followed these instructions to delete Panzer Corps registry keys in Windows Vista.
1 ...

Hey,

I bought Panzer Corps Afrika Korps, installed it and after that registered and updated it by Game launcher, liked it a lot, and bought Mega Campaign, installed and registered it but it did not work. Those campaigns didn't show up. I wondered already why it asked to launch the game by Panzer ...