Hello everyone!
You should now be able to claim your Steam Keys on Desura. If you are an Indie Royale customer, please follow the these steps:
1) Log into Indie Royale
2) Locate and claim your Desura key
3) Register your key on Desura
4) Go to the "Collection" page or click this link here
5) Hover over "SilverQuest Gaiden" and select "Your Keys".
6) Copy and paste your Steam Key into the "Activate a Product On Steam" window in Steam.
A window should pop up that will display your Steam Key. Regular Desura purchasers can simply use steps 4 through 7.
Please let me know if there are any issues. -Ouren
PLEASE NOTE:
I have given Desura keys totalling a little over the total number of sales we've had on that platform. We don't expect to make many more sales via Desura, but once the pool of keys are gone, they are gone. If you have issues with this in the future (unlikely), you can email hello [at] wolfgame [dot] com and we'll get you sorted. We will not be generating new keys beyond this pool. Get 'em while they are hot!
Welcome to our Steam Community!
EDIT 1
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If you having an error regarding "You need to get keys from Indie Royale where this game was purchased.", please register your Desura Key on the Desura site. You can create a dummy account if you so desire.
I found this thing where people were able to get their Steam keys without downloading the Desura client. Worth a try if you really REALLY dont want to install anything.
http://www.reddit.com/r/GameDealsMeta/comments/2b77sd/guide_how_to_get_steam_keys_on_desura_without/
EDIT 2
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Steam user Waruigi-sama was able to get the above Reddit guide to work if you do not wish to install the Desura Client on your computer. Thanks!