If you use or support users with Fujitsu ScanSnap scanners, you might visit the ScanSnap Manager downloads to see if your model is listed and update your software to support Catalina and newer OS for Mac.
Like most, anyone on High Sierra or Mojave, was warned that with Catalina, and likely Big Sur, will need to replace their 32bit apps with 64bit versions. Otherwise you shouldn’t upgrade to 10.15 (Catalina) or Big Sur (release coming in late 2020).
Some have contacted Fujitsu but without any confirmation of updating the old Scansnap Manager. Instead, Fujitsu had release ScanSnap Home, which lacked granular feature set that ScanSnap Manager has. Not only that, but Home had taken on a more “Icon” look than intuitive settings.
But if you visit the ScanSnap Manager downloads (7-2020 it was at V7), you will need to remove the ScanSnap home version.
(Mac) Drag the ScanSnap Home folder )in Applications) to the trash and empty. Then, open the ScanSnap Online Update folder, and then open the SUB folder and run the online uninstaller. Once it completes, it will remove the Update folder from Applications. Now you can install the Manager software.