So

I preordered the game, on day 42, and today I wanted to download the newest file.
But how? On this Website I can only preorder it again, and I wont spend 15$ again and again :(

You should have received an email from sendowl with a download link. I had some trouble finding it myself because "handmade hero" wasn't mentioned in the text or subject and on top of that it was caught by the spam filter.

When you preorder, you get a link to the daily download in your email.
Open that link and you'll be able to download the newest build.

Edit: fcatalan beat me to it :)

Ok, thank you two very much. I found the email and all is well :D