I downloaded Assassins Creed Chronicles: China on my PS4 without buying it. How do I?

The only option I was given was downloading it, it wasn't attempted piracy or anything. But I can't buy it so it will launch now. I deleted it to see if it would let me buy it, but nope. Only download.

I mean, they WANT money right? And they want me to play their game? So why makes this so counterintuitive?