Hector Episode 1 won't work despited bought

I've bought and downloaded Hector Episode 1 from this site. The launcher correctly shows the "play" option and now launch options so I guess it's unlocked. My internet connection is active and running too. But still, in the game itself it throws me to a "buy now" screen after getting the pants, I can't interact with anything on that screen with my mouse or keyboard and have to force quit the game.

How can I fix this? I want to play the game I've bought.

Windows 7, all updates, latest version of game from this website.

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