It has been one download for all esc's since I've been running Tekin.
This should do every contoler and when you hook it up, the software just knows whats connected.
http://www.teamtekin.com/hotwire.html

But now I see that they don't list gen1 on that page, just the new esc's and randy linked to a link when he was taking about gen1 compatibility with the app.

So are there now two places to go to for software? I wouldn't think so. I will look for the link.