Activation issue

[krakelohm]

Howdy,
Hey I purchased Amnesia back at the end of November. Was playing it for a while without any issues. So I had some free time today to give it a go again and when I start the game back up it is going through the setup again asking for activation. I put my email address I used to activate the game and it is telling me there is no user with the email address on the server. This is the same machine I originally downloaded the game on and was playing fine a few weeks ago, can anyone help?