bought royalty on homepage - no steam key?

[opleins]

Hi folks,
I think I have done something stupid: I just bought Royalty on the Rimworld homepage because I was sure, I would also get a steam key. This does not seem to be the case or is there any way to obtain one if you bought the DLC from the homepage?

Best regards,

[Canute]

On the homepage is somewhere

How do I get my Steam key?

— You can get it with the automated tool on this page.