Just went through the whole re-install when I got a new system, still glad my 3 update doesn't yell about not seeing VUE2. I can only install VUE4 if I install V3 first, V4 asks for the V3 serial but doesn't accept it unless I have V3 installed on the same drive. Reverse from 4.1 to 4.06 is just matter of copying the [BACK] folder to the VUE folder, but that's part of that secure VUE feeling hmm :)