I was just able to download a 2015 updated driver for my Mustek 1200 at this website:
http://www.mustek.com.tw/support/driver-manual-downloads.html#product=ScanExpress%20A3%20USB%201200%20Pro. Haven't been able to try yet with the scanner, but fingers are crossed!
http://www.mustek.com.tw/support/driver-manual-downloads.html#product=ScanExpress%20A3%20USB%201200%20Pro. Haven't been able to try yet with the scanner, but fingers are crossed!