Where do I get my Steam key if I purchased elsewhere?

[Styg]

DESURA:
The Steam-keys are now avaible on Desura:
0. Make sure you purchased the game from Desura. The Desura key you got from Groupees will not provide you with a Steam key.
1. After your Login into Desura, go to your collection
2. Search for Underrail and click Keys (or follow this link)

GROUPEES:
1. Log in.
2. Locate Underrail.
3. Click on it.
4. Get the key.

GAMERSGATE:
1. Log in
2. Find Underrail in your library
3. Click "Show Serial Key" button on the right