Help!!!
Sorry for the late reply. (Late in my opinion, considering your case),
Contact orders@fastspring.com and wait for a reply, they will most likely ask you a few questions to verify that it’s you. (Do not give passwords, or credit card info out.) If all goes well, you’ll have your copy back in about 3 or 4 days. In the meantime, occupy yourself with the demo! 
All you need to know is here:
http://www.greenheartgames.com/game-dev-tycoon-product-updates/
Search for emails from mailer@fastspring.com. You should be able to find the download link. If you can’t find it follow the other instructions on that page.
How did your computer reset…?
You need to use the search function on the forum.
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