“There is no driver for the OS Version you selected. The driver may be included in your OS or you may not need a driver.”
https://www.usa.canon.com/internet/portal/us/home/support/details/scanners/support-scanners-canoscan-series/canoscan-d660u?tab=drivers#Z7_MQH8HIC0L88RB0AMD0F1Q42K25
Found that already. Don’t know how to install driver from OS for this scanner. Suggestions?