Hi Dan,
yes, printing the plan in X6 to pdf worked.
I was able to print from X5 to Microsoft XPS.
The reason I kept the X5 plan in X5 was because when I first opened the X5 plan in X6 my cad blocks were coming up out of scale.
For some reason the next time I opened the X5 file in X6 my cad blocks were Ok, and I had another X5 plan to edit today and it opened in X6 fine, so I was able to edit it in X6 and all appears good.
I don't expect to use X5 anymore on my Windows 8.1 machine.