Problem with filament render engine.

Raynesinder

I just updated one of my computers to the Daz 4.14, it is an older computer, windows 8, and filament is not functioning. The filament option is there just above Invidia Iray option, but it is grayed out, and will not let me select it. Can anyone let me know how to resolve this, or if it can't be resolved? I would really appreciate it. Thank you