It seems Valve has made it easier to claim free stuff on the Steam store, so you no longer need to quickly try to install something free and back out of it to claim it. Seems this happened somewhat silently but it's obvious enough that no one is going to miss it.
On Steam store pages, there's now an Add to Library button which works for anything that is currently free on Steam.
Such a small but needed change. Especially useful when there's a game that has a 100% discount for a limited time, you can now just easily claim it so you don't miss it. Seeing games on a free giveaway happens quite often too, and having to do a pretend install to claim it was quite a nuisance, while not always the case often you would need to do that. This is especially useful for free DLC, as you would pretty much always need to go through it. Now it's just a one click — nice.
Quite happy to see this change finally happen!