The best thing to do is to go to Lumicron's web site, find the support or downloads section and get the latest drivers. Check in your documentation.
WARNING!!!
DON'T go to lumicron.com. It's a totaly unrelated squater site.
If there are absolutely no Windows 8/8.1 drivers available, you can try to install your drivers in compatibility mode. That way, your Windows 8.1 will try to look as if it was Windows XP, but only for that software.
Electro, March 2014