It doesn’t work and I don’t know why. I want to play it online
You really need to give more information about what doesn’t work for you for anyone to be able to give you some help. See also How to report problems.
Also, since this is a problem with a specific module, it should really go to the Module Support sub-forum. And please provide a link to the specific module (e.g., 1914: Offensive à outrance), so that others can better help you with your specific problem.
See also the Play modes section of the Documentation Index page. In fact, the Documentation Index should be the first stop when you have trouble.
@uckelman - perhaps it is time to see if the PR: Update to link to forum posts and message owners should be applied so that it is easier for users to post in the “right way” 
Yours,
Christian