General Info

Models: 485wi ,585wi and 685wi
The 685wi is networkable and does not require any drivers.
Some teachers plugged their 685wi into the network and using IOS android or a chrome device (PC/windows not supported) they would cast items to their Epson using the Iprojector app.
Iprojector: https://epson.com/wireless-projector-app
485wi and 585wi require Epson Easy Interactive tools downloadable here for win10 64bit (they both use the same version): https://epson.com/Support/Projectors/BrightLink-Series/Epson-BrightLink-485Wi/s/SPT_V11H452520W?review-filter=Windows+10+64-bit
Also attached to this wiki (but check for newer versions and update).
To use the Pen with the projector you need a USB cable from the projector to the computer and the Easy Interactive Tools. The driver should be installed with easy interactive tools.
The pen would be used on the whiteboard and the projector would sense the pens position via IR (Mark L says sunny days caused flaky performance) and send info back to the computer via USB.
The Easy Interactive Tools also had smartnotebook like features.
Smartnotebook 10 was historically used. It worked in win7. License and installer will be attached.
They should get a newer version and license it. It may not work with windows 10. Would have to be tested.

Calumet Schools CLK Projectors