Just a follow up.
Yes, you can open TT2020 in offline mode and do your taxes. But when its time to netfile it doesn't recognize TT2020 standard as being authorized, hense it wants you to buy returns at $19.99 each.
But, I did see on this forum that someone used their phone as a hotspot and then connect to the internet through your phone. I tried this , TT2020 opened as it should. It showed that I had 8 returns remaining. Everything worked as it should, finally.