Install the packge to the root folder of Original G2 NOTR game. Start Gothic2.exe and enjoy. Don't forget to start new game or you will not able to see and use new in game stuff.
There is still many thing that can be improved/changed - from textures to scripting. But I'm just one and this world is big. BTW special thanks to Mark for his help.
Requirements for mod:
G2 NOTR and Report-Version: Gothic2.exe is needed otherwise you will have problems (missing dialog text).
Nature's Fury v1.1:
extract it to Gothic2/data/ folder.