I used to have the same scanner and used the following instructions/notes to set it up on Windows 8, 10, etc. If it doesn't work for you, just use an older laptop with XP or setup a virtual machine on your PC.
1) Install the NikonScan software
2) Connect the scanner
3)Reboot following these procedures:
They disable requirements for Win8 to reject unsigned drivers.
4) Go to device manager, find the device and update the driver by pointing to NksUSB.INF file. This file should be on the installation CD or maybe in the installation folder on C drive, don't remember.
Troubleshooting if your Tools Palette disapears:
1) uninstall Nikon Scan
2) Manually delete any leftover files
3) Run RegSweeper.exe (on original CD under utilities)
4) Reinstall