Graphire 4 driver issues (Windows 10) resolved! I've installed the drivers and settings manager (cons530-3int.exe, from the EU Wacom support website) but when I connect the tablet, Windows automatically applies its generic HID-compliant digitizer and mouse drivers, and the Wacom Preferences application reports that 'a supported tablet was not. Select Updates to see what (if any) updates are available for your Wacom product. Important: Your Wacom product must be connected to your computer to see available updates. If updates are available, select the respective link and carefully follow all instructions as you update your driver or product. Due to data privacy laws, switching to the language you have chosen will automatically log you out. Your current account will not be available in the language and region you have selected.
You might have solved the issue already by yourself, but for the sake of posterity I'll give here some simple advice. It seems Wacom closed their forums due to spam, so the link to the forum topic won't work, for now at least. However, my original post contained the name of the driver package, including the version number.
The Wacom main site, which the dead forum link redirects one to, doesn't seem to either host this version (for Windows) or at least doesn't list it. However, if you head over to the Wacom Europe site, wacom.eu, you'll easily find this particular driver package by going to the Driver section and then selecting Graphire4 and Win8 as the options. This driver (cons530-3_int.exe) is then what the site will list. Just be sure you are at the EU site, as Wacom seemingly loves to redirect one to the common US site, wacom.com, which, like I said, won't be serving you this driver version.
The url ought to look something like this, at the time when I'm writing this post:
Wacom Cte 440 Driver
http://www.wacom.eu/index4.asp?pid=29&lang=en