I didn't remove the prefs folder after updating from 4.8.1 to 4.9.7 or 4.9.11
I didn't receive any message to say my incompletes were unable to load. I just noticed the downlds window was empty when there should have been a dozen or so items there. I'm not sure it's a major issue but a few other people had complained about the same thing so i guess it depends on one's system & set up. But just something to keep in mind for the devs. It might have been fixed by now anyway with the newer betas.
Come to think of it, I couldn't load 4.9.7 so I had to force quit using control-alt-del so perhaps that's what caused it. Windows is "so" sensitive about such things!!!
But then again i've done this before with 4.8.1 without loss of my incompletes. But prolly the update was the last hay strand it could stand. lol