Turbotax 2019- why critical updates now in May 2020,?

I just opened 2019 to check something and it downloaded "critical updates".  since I filed 12 months ago,
WHY are there critical updates from 2019 NOW? what if their update corrected something where my refund should have been higher?   Since don't notify us of programming error they know of but haven't yet corrected and only guarntee if not enough taxes paid, but no guarantee for under report of refund due to their mistakes, I have lost trust in them.  Welcome explanation and reassurance if true.