He sold out. Cant blame him. He has been working on this for a long time with little compensation. What sucks is I am responding is way too expensive. What a shame...
Get it while you can! 71 can be found here:
https://files.catbox.moe/sv1mnp.zip
I have a working proof of concept two tone detector working in javascript. Plan is to have it interface with Twilio, Signalwire, Bandwidth, CallFire, etc... Anyone using it enters their preferred vendor credentials and detected two tones will be sent as text messages. Same same as TTD but with much better reliability.