Thanks for your response.
Probably I didn't see it there andyes maybe the other thread would be better.
I reinstalled now all again from admin rights and on a clean folder the gwx installation succeeded without an error the 2nd time. So somewhere I must have done something unexpected before.
Now I have installed SH3 commander (the latest version, I had it before too), but I did not try it out yet. And I am not sure if I should
One question:
In stock sh3 when I start the "diesel" engines (1/3 ahead etc) I hear them clearly. When GWX is installed I hear them only in the "outside" view. As I said I did not tinker with the TC settings this time and the previous "SH3 own document files" were deleted.
I will check also the SH3 cmdr. thread for infos
Thanks again!