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From my experience the purchase link on the main page should have the price listed as $0.00 and say 'download now' instead of 'buy'. If you click on it it will bring up the usual donate/pay pop-up but have a link that says "no thanks, just take me to download" or something similar. When you hit that it'll tell you that need to link it to your account and i think it'll just have a button on that page to link them. Sorry, I did it about an hour or so ago, so i don't exactly remember everything that was on that last page, but i double checked and it linked it to my account. Hope it helps.