Driver updates for the Fujitsu ScanSnap S300 halted at Windows 8.1, however the 8.1 drivers can work on Windows 11 and Windows 10 meaning this device can still be used. Given how expensive these document scanners. Official drivers can be found on the Ricoh/Fujitsu website which isn't user friendly. Direct links to the official driver download can be found below.
ScanSnap Manager (V4.5L10) Setup Program
File: WinScanSnapManagerV45L10WW.exe
34515269bad6a93a957c778d05be8f0387f7aa86ca2d06f6f6da571957a48fd8
ScanSnap Manager (V4.2L14) Setup Program
File: ssv42l14W_300.exe
cdd17d3c2a26c0e761d76c6a69a0827340508e85800b38d3e48cf2f767086f59