In that case it's REGIONBLOCK
(sale in Germany is locked, but redeeming/owning/downloading).
Yes, that's it. An LV-version was and is available on steam. I got it now and patched it with a UCP.
I already owned NV on DVD as an LV-version and played it uncut with the help of an UCP, so the store-block is useless and GOG should've known there is a localized version and should have sold it here. So, THERE LOSS.