Slitherine

I just downloaded the game on steam. The game intro plays and goes to the main menu.I can click play game and then campaign but the next screen just does nothing. I can't get the game to play.
It does say I need to enter some product key when asked but I have not been asked to enter it? is that why the game won't play? Please help.

Once you select the campaign from the list, and hit the bottom right Select button, you need to select the appropriate territory on the map, and then the bottom right selection button should activate.

Cheers

Pip