What I did was to contact RJ and get "extra" V5 boards .... the primary changes are addition of the snubber resistors, an extra LED and a resistor, and different 3.3 regualtor. The board would work without the snubber resistors but the other new componenets are necessary Then build the V5 with the older kit... (I was upgrading from V3 to V5 with unbuilt kits)
I looked at what it would take to mod an older board up to the V5... It is not an effort I'd recommend.
Larry