no steam key? no mods :-( ?

Hi there,
I just bought your game as ‘standalone’ version. Now I would like to download all the mods from steam to use them.
Where do I find the key?? I thought buying an online version I also get the necessary steam key. But after the transition I did not find anything.
I am quite unhappy - would you please give me a helping hand? If you need more details, I can share them.
Do I have to buy a second copy at steam? That would be unfair.
thanks and greetings

the steam key is actually in the purchase email.
You don’t need steam to use mods though, we have a mod page with download links for a lot of the most popular ones.