I can only speculate, but I'm pretty sure that KSS 5.x was only written to run on PCI motherboards, and all the W95 versions were written to work with ISA motherboards. My guess is that the LPVXWRT driver can't talk to an ISA-era MFC card. But I think the only way to know for sure would be to contact KUKA's hotline with the full hardware/software specs. There might be a way to "downgrade" the drivers in KSS 5.x without bringing down the whole stack.