No, you've already purchased the game.
If you mean the CENSORED? DOWNLOAD THE UNCENSORED VERSION HERE caption at the bottom of the page? That always appears, no matter which version of the game you're playing.
If you're not seeing a huge nag-screen during the sex animations, it's because you're playing the un-censored version. Which is the one available for download here.
I hope you're enjoying it, the game updates on the 2nd of every month.