For people interested, this DLC is still available for free in the EU region on Alienware Arena (I don't know for other regions): https://eu.alienwarearena.com/ucf/show/2165761/boards/contest-and-giveaways-global/Giveaway/medieval-kingdom-wars-royal-blood-dlc-key-giveaway

There are still a looot of keys at the time I write this message (and the stock is increased every day).

Great! Thanks mate! You rules

Thank you.