You Want to Return the Scanner Driver from ScanSnap Home to ScanSnap Manager
For ScanSnap iX1500, ScanSnap Manager cannot be used to perform a scan. Use ScanSnap Home. When you want to return to ScanSnap Manager after ScanSnap Home is installed, perform the following:
If your operating system is macOS Catalina v10.15, you cannot install ScanSnap Manager.
Use ScanSnap Home instead of ScanSnap Manager if ScanSnap iX1500 is likely to be used with the same computer where other ScanSnap models are used.
For ScanSnap iX1500, ScanSnap Manager cannot be used to perform a scan.
ScanSnap Home and ScanSnap Manager cannot coexist on the same computer.
Uninstall ScanSnap Home.
For details, refer to How to Uninstall the Software.
Restart the computer.
Install ScanSnap Manager.