C-Pen 200/600/800 do not support 64 bit Windows but it *may* work if installing the C-Pen software in Compatibility mode.
Right click on the installer file (C-Win_3_24.exe) and then select Properties + the Compatibility tab and get a window like in the image below.
This solution is NOT officially tested but MAY work.Software downloads for discontinued products
C-Pen 20 + 3.0:
C-PEN 200/600/800 user guide
Check you Windows system
This article refers to computer connected (USB) C-PEN models.
To check your Windows system…
(Click on images to enlarge)