Doing end-of-year bookkeeping (year end was September 30); already delayed a week because of this video card nonsense. I find I must check something in KiCAD, so I go to open the program (Kicak 6 because that's what was installed) and find it doesn't work, complaining about a library missing that no doubt was deleted during the recent "upgrade."
After several hours of work trying to compile KiCAD 8, I ended up digging out the backups to restore the old library so I could run 6.