It'll be the download button at the top of the page, where it says "you own this game."
Viewing post in Bimbo Rivals Full Release comments
Thanks. I found that that would only allow me to play online, though, rather than download the game. Digging further, it turned out that you had to spend at least $3.99 before you could download it, which hadn't been made clear. Anyway after playing online for a bit, I decided that the game wasn't for me.