Been Gone For a While- How Do I Re-Download?

I haven't played BeamNG in a while because my copy of the game sort of self-destructed in a hilarious manner and the updater just endlessly kept creating folders and duplicating itself and failing, so I probably need to re-download a clean version since I have 3GB of updater.exe duplicates...

How on earth do I re-download BeamNG? I read some old threads and followed some links, but in the end the only option I have is to install Steam.
There is no longer a "Download" button at the top of the page here.
Any help?
The last game version I remember began with 0.3 but apparently while my updater was screwing around there have been numerous new versions released according to the changelog...

 

The updater has been outdated for about a year. The game is now on Steam Early Access, and you can install the game on Steam using the steam key you received in an email.

 

Thank you.
It wasn't made clear to me that the game moved completely over to Steam while I was gone.


Come to think of it I probably shouldn't have deleted my glitched franken-BeamNG copy then!

 

Haha, yeah. Contact support if you can't find your steam key.