Im not at my home computer so don't have P5 in front of me but I think I can walk you through it. In your P5 library at the top of every page is an up folder. click on that till you get to the one that shows both the p5 and the download library at the bottom of that page is an add button, click on that and navigate to your P4 runtime select that hit OK and your p4 library has been added. that simple.