Hey I bought a copy of Game Dev Tycoon a while a go but since wanting to play it again all I find is buy on steam with no redownload.
I can supply my payment info if it needs it.
Help!
You should email orders@fastspring.com, provinding all the information you still know and is relevant (email, full name, etc)
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this is correct 
If you still have the download email from your original order, you can try the link in that email to access your downloads (sometimes a search of your email archives for “Greenheart Games” is all it takes), or you can try the updated email which was sent to every customer with a new download page (which you can add to your favourites). The new link will also show your personal Steam key.
If you do not have your emails, or your details have changed since purchasing the game, you may send an email to orders@fastspring.com as @Pastract has said. If you’re not sure what to send, you may contact @Charlie via PM on the forum, or via support@greenheartgames.com