I just caught one of those ads over on the left corner of the TVGOS listing display, from all places, TVGOS itself. It referred users of TVGOS to their webpage http://www.tvgos.com/dtv
for info on TVGOS and DTV.
Their website now contains lots of information about getting analog TVGOS to work, after conversion to DTV. It all apparently rides on whether equipment used in getting the signal to your TVGOS device supports spec SCTE 127 2007
(aka "Carriage of Vertical Blanking Interval (VBI) Data in North American Digital Television Bitstreams").
It even allow one to look up your local cable system to see if it is known, yet, if it does indeed support SCTE 127. Plus it lists digital STB's which are known to support SCTE 127. If the analog stations still carried by your cable company support SCTE 127, you will be OK. If the analog output from your digital STB supports SCTE 127, you will be OK.
If you get over-the-air digital channels, then you need a STB box which supports SCTE 127, which happens to be the DTVpal box talked about extensively in another forum here at AVSforum.
Plus, after years of silence, there is even a TVGOS customer support email address, where you can ask for help.
Things do appear to be better than I had hoped!