First go to the Designjet page on the HP.com website and choose the series for your plotter. On the next page choose your specific model and go to the driver page. If your plotter is supported in Windows 10 you'll see a driver listed in the operating system drop down menu. If you don't see one, it appears that it isn't going to work in Windows 10.
But--wait! Go here to find out how to make this work!