I'll warn production about this. I'm sure they will fix this tomorrow.
We apologize for all the inconvenience.
Thank you Paulo.
ORIGINAL: Philippe at bay
I just bought the Collector's edition and registered it with Slitherine. I also registered the four games (Waterloo, Ligny, Quatre Bras, and Wavre) individually, using the same registration key.
Next to each of the games except Wavre there was a place to click to get a Steam key, which I promptly used.
So I've now been able to register Waterloo, Ligny, and Quatre Bras with Steam (which, based on the checkmarks in their DLC ownership lists, recognizes that I own them) but I have no way to register Wavre because you neglected to make it possible to acquire a key.
Wavre is being sold on Steam along with their version of the bundle, so it's not like the game can't be registered with them.
And for the avoidance of doubt, although Slitherine uses a single key for all four games, Steam requires different Steam keys for each one.
Please do the needful and send me a Steam key for Wavre.
Apologies for the inconvenience, Wavre followed a different setup and as such the Steam Keys aren't available to be redeemed for this title. As a workaround I have attached the Wavre Steam Keys to the Collector's Edition. You should now be able to Redeem a Wavre Steam Key by registering your Collector's Edition.
I hope this fixes your issue, please let us know if you have any problems.