To be honest, I was shocked they have v4 available--I would have thought they would have been sold long ago. PEDesign Next is the newest one and they are calling it that instead of v9. I guess they want us to think it is better, not having a number after it. There are serial to usb adapters you can get to use with the older boxes--that's what I did until I upgraded to v7 when my husband built my last computer and put Windows 7 pro 64 bit on it.