I just got off the phone with Fujitsu support and she told me that I could download the driver for the ix500 as a workaround and it should work. Caveat from Fujitsu: First see if the S1500M works under Mojave on its own. If not, call Fujitsu support - 800-626-4686, option 1 for help. If that doesn’t work, I’m switching to an Epson WorkForce scanner.