Maybe it's time to buy a new scanner.
Then I saw a offer on Freecycle for an HP all-in-one. The owner had also gotten it via Freecycle, but neither she nor the previous owner had ever gotten it to work. I figured it was worth a try. So I hauled the beast home and plugged it in. It was jammed, so I cleared the wadded paper out of it. Then it commenced to complaining that the carriage was stuck. This turned out to be due to the ink cartridge lid being wedged up in the way, so I folded that down. Then it was unhappy because it had no ink. Sure enough, HP makes their all-in-ones require ink cartridges for scanning. Ink, you see, is the real profit center. However, I was loathe to buy even shady third-party refilled ink cartridges just to use a scanner.
Then I realized I hadn't tried VueScan. I fired it up, and it cheerfully ignored the printer's protests and scanned anyway! Hamrick, you see, doesn't give a toss about HP's obnoxious money-grubbing. I originally bought this software because I had a scanner that wasn't supported any more by the manufacturer. And I've used it for many years, with a variety of old weird hardware. And it just works. While I can't recommend HP/Compaq (my next laser printer will likely be a Xerox), I can heartily recommend Hamrick.