I spent too long trying to find new drivers that enable scanning, with no luck, until I found Vuescan. It’s a free trial (with watermark). I’m sure it supports lots of scanners, just get it and see before paying.
After a $29 Paypal and 7MB download I was scanning instantly – didn’t even have to point it to my printer.
Note that if network scanning seems flakey, I’ve had better luck going with USB