I wanted to post here rather than that iX1500 thread since I have an iX500, just upgraded to Mojave, and tried to upgrade from ScanSnap Manager (which still works!) to ScanSnap Home. I had previously tried the combination booting from an external drive that has Mojave and that was successful.
BUT when I went to install ScanSnap Home again it said I had to have a license (didn’t do so before) and once I signed up said that all 5 of my licenses were used. This forced me to 1) send off an e-mail to Fujitsu and 2) remove ScanSnap Home and reinstall ScanSnap Manager.