[FREE] Influent Free Edition: French-Italian-Korean

1.Click the steamdb link Madjoki provided
2.Click the app id of the items that you want to add to your account (You can add all
of them if you want)
3.Click the green button at the top of each of the pages to add them to your account.

Open link above, takes you to steamdb,
In this case, click the app ID for the one(s) you want,
Click the button that says ''Install'',
Click ''Open Steam Client Bootstrapper'' when/if it asks.
Once the Steam client bootstrapper opens the game is already added to your account. So you can click ''cancel'' here if you only want to own it, but not install it now, or ''next'' if you wish to install it now.

You don't need to have the Steam client open to do the above, but if you do have it open the bootstrapper opens up quicker, handy when you are adding many items this way to cut down on the waiting.

If it takes you to the Steam store page instead of opening the bootstrapper:
You have maybe redeemed too many games that hour (only 50 allowed), or
The game isn't free (maybe due misinformation, wrong timezone, etc).

Yep, worked for me anyway