Scanner manufacturers are notorious for making sure your scanner won't work on any future operating systems you upgrade to.
For infrequent use of hardware/software, it is always a good idea to dual boot Windows XP/Windows 8 then simply reboot into Windows XP.
When Vista came out, here's how I tricked it into installing a Windows XP-only scanner. I found a similar new model then:
To install Visioneer One Touch 9020 scanner under Windows Vista or Windows 7:
1) Install Windows XP 9020 drivers.
2) Install Windows Vista drivers for 9420.
3) Plug in your scanner and manually select 9420 drivers for it.
or go to Control Panel > Device Manager, right click on the Unknown Device (it's the one with Properties > Details of USB\VID_04A7& PID...) > Update Driver Software... >
Browse my computer for driver software > Let me pick from the device drivers on my computer >
Next > UNCHECK: Show compatible hardware > Select Visioneer on the left side and Visioneer 9420 on the right side > Next > Yes > Close.
