For some reason I have lost all of the brushes I have installed/ All except the default brushes. This is the second time it has happened. I can get more but I can't figure out what happened. Using PS2020

Brushes once loaded don't generally disappear, have you looked at Window/brushes in the menu? there should be folders in there, in PS2020

I had to go back to my download file and reinstall all of the brushes I downloaded. Kind of a pain. Still not sure how they disappeared.