Photosmart 1660 Scanner for 32 bit Windows is not supported and an alternative Epson driver has to be used.
To get this download drivers for Expression 1680 for Windows 10 32bit.
Unzip the files in a directory where you can find it easily.
Windows 10 will recognise your 1660 scanner when you plug it in but will not run it since it cannot find the driver for it.
Got to Control Panel > Hardware and Sound>Devices and Printers and you should see the icon for the scanner there.
Click on the scanner icon, select Properties>Hardware>Properties>Drivers.
Select update driver or install driver.
Then install the 1600 driver from the unzipped directory. (you can try the 1680 driver if you want but I used the 1600 driver and it worked,)
When the driver is installed, the Epson 1660 Photosmart scanner should work.
The software will not work as the original did but with a little experimentation you should be able to get the same results.