Well that's not quite good :-(
I thought I get the Imperial Edition on GOG when I choose the GOG version. Now I have to download and update the game from 2 different places... Then it would have been better to get the LarianVault Version because of the additional steam key...
At least I hope that we don't get problems with the upcoming GOG Patch Files when we install the Imperial Addon from LarianVault over the GOG normal version...