This is a question for Fujitsu. We don’t make ScanSnap Manager or their hardware so we can’t comment on its compatibility. That’s up to the manufacturer/developer of those items.
As BLUEFROG said, its a Fujitsu issue but at least you should expect it to work under Mojave - it will still support 32bit apps although the MacOS thereafter will not: macrumors.com/2018/06/05/mo … -bit-apps/