A friend of mine needs the driver (disc) for a D-Link DWL-810+ wireless ethernet bridge.

Can anyone help? Thanks!

A search of D-Link's site says that model is discontinued, but here's the support page:
https://www.dlink.com/products/?pid=DWL-810%2b&tab=3
I don't think there is an actual driver, but there is a quick start guide.
-Jeff

Try this link:

https://www.opendrivers.com/categorycompany/1113/12678/network-d-link-free-driver-download.html

Hope it helps