I also have an old Mustek scanner with outdated drivers, with no hardware issues.
Luckily, my scanner is USB, and VMware Workstation allows to forward complete USB devices to a guest OS. When I need to scan something, I fire up a virtual machine with 32-bits Windows XP inside, with OG drivers, and scanning software.
Aunt's computer had been upgraded to Windows 10 and HP printer/scanner had the scanner part stop working...
I was cursing Microsoft and HP for half an hour reading various failed workarounds. I was getting serious "shaving the yak" vibes until I found Vuescan.
Best $25 purchase for a software in the last 10 years.
VueScan is really really huge in the photog community for those who still have to handle (or restore) film negatives. Not only does it continue to support scanners that have long since been abandoned by their manufacturers, its just straight up better software.
I've used it for shits and giggles, and it even did quality work on a generic Epson flatbed better and faster (and lets face it, Epson flatbeds aren't good, getting anything good out of them is very difficult).
Luckily, my scanner is USB, and VMware Workstation allows to forward complete USB devices to a guest OS. When I need to scan something, I fire up a virtual machine with 32-bits Windows XP inside, with OG drivers, and scanning software.