We've been using Prince happily for a few years now, and it's time to change computers. I'm hoping to move a single-user license to the new computer, but it's giving an "Inapplicable license" error when I try the old license on the new machine - not surprising given that I'm moving to a 64 bit machine and the license is for version 5.1 instead of 8.0. How can I make this work?