This has been a concern for me, as my current P4 directory is almost 6 gigs. From what it sounds like, I can install P5 as a seperate program, and link to my P4 content, without having to make a duplicate runtime folder? I'd like to have both running for a while side by side until I get up to speed with P5 - got a few projects going that I want to stay consistant looking. Thanks! Tempus