I think I was misunderstood. CCleaner Driver Updater is reporting I am missing a new driver for a ACER S271HL. I don't own a ACER monitor. I have 2 connected monitors, an Asus and AOC monitor, and both of those drivers are installed and working.
I also have the software Driver Booster 8.5 that does the same thing CCleaner Driver Updater does, checks for out-of-date drivers and downloads and installs them. It is not reporting the erroneous ACER monitor.
Thanks for your help.