If you purchased a Stardock game / DLC from us, purchased certain products from one of our software partners, or received a gift key for registering, you will do so via the Steam client.
For Steam games purchased directly from Stardock, you can get your Steam key from here:
https://www.stardock.com/support/productkeyretrieval
For any Steam product that was purchased from one of our software partners, you need to refer to your receipt to get your key. If you no longer have your receipt, you will need to contact the vendor directly.
You will need the Steam client open (not the Steam website) to be able to activate the game. (obtain the Steam client here: http://store.steampowered.com/about/ )
Once you have your Steam key and Steam installed, open Steam. At the bottom left click ‘Add a game’ and select ‘Activate a Product on Steam’
The Sins game pictured is just an example:
Next, you have a new window with a couple of screens with agreements, instructions, etc. You will then be prompted to enter your key.
After that, you will get confirmation and install info screens.
That’s just about it. You can click the downloading area at the bottom of Steam to open up your downloads, and you can also view them from your Steam library.
If your game/software is already in your Steam library, you do not need to do this.