HelloTech says no tech in my area??? How do I install a Video Doorbell Pro where there is no existing doorbell

The "Video Doorbell Pro" is not a doorbell.  It is a doorbell BUTTON.  If you don't have a doorbell system (and worse, the RIGHT doorbell system) already installed, then you can't install the Video Doorbell.  

Although you don't have to have an ENTIRE doorbell system, just the doorbell power transformer to provide the power the Video Doorbell.  SS has allegedly released an update which if the Video Doorbell Button is pressed, the base now emits a doorbell sound.

I just dealt with this myself a few days ago.  My house doesn't have a doorbell, and I needed to get power to the SS doorbell cam.  Fortunately, there were light switches on the interior wall just opposite the area the doorbell needed to go.  I bought a transformer at Amazon https://amzn.to/2Bi7c6Z  I pulled the light switches out, installed a metal electrical box inside the wall, mounted the transformer to it, connected some doorbell wire to the transformer & drilled a hole & ran that outside.  Then connected the transformer wires to the wires for the switches to get power.  Hooked the doorbell up to the new wires outside, and bang, it works!  Hope this helps!