HumbleBundle and the DLCs

[ev]

Hi there,
received HumbleBundle gift keys for BouT and CritterChronicles today. It's said at the HumbleBundle page these versions would be Collectors and Digital Deluxe Editions. For some reason I can't find where to access the extras. If I click on DLC in my library I get directed to the Steam shop, where Steam offers me to buy this content for some ten Euros extra each...
Can anyone please tell me where I find those?! Or do I maybe have to have the games installed to be able to access the extras?
Thanks anyway...

[swashbuckler]

It's under your Steam directory -> Steamapps -> Common -> The Critter Chronicles -> Digital Extras

On the DLC page the buy button is green but the digital extras are already there.

And BTW, the Making Of videos are not to be missed!

[ev]

So it's true, these games have to be installed so one can access the exta content. Thank you for your kindness.