The Winds of Winter for Vassal
If you really want to play this expansion for the board game but do not have an opportunity to make one. I can recommend the online version made for Vassal. Vassal is a game engine used essentially for playing board games online. There are several game of thrones modules for this engine, and I just found one made specifically for this expansion.
Vassal is free to download and very easy to use, you can download Vassal here.
The Winds of Winter expansion for Vassal can be downloaded here.