ScanSnap is not working with MacOS Catalina

It's 32-bit, so I won't work with Catalina if the unless the developer provides an update. Maybe this link can help you? https://www.fujitsu.com/global/support/products/computing/peripheral/scanners/scansnap/faq/macos10134.html

Otherwise, try VueScan

The paid, non-subscription, 64-bit VueScan supports a great many Fujitsu ScanSnap devices without any Fujitsu drivers or supporting software.