HI Jan,
My O/S language is English. Windows 7, 64 bit.
I use X-Plane through steam, so point the installer to the 'common' path and then the 'X-Plane 11' folder. It creates another 'X-Aviation' folder with the uninstaller in the root of X-Plane, but I think this is correct as this was there prior too when the aircraft was working.
Thanks,
James