My Apologies, I am a little unclear on the question. We strive to ensure that Forest Pack 7 will open Forest Pack 6 files, but as with any major update and though it is rare, there's a small chance that there can occasionally be changes that cause the scatter to alter slightly. As a result, some users prefer not to update in the middle of a project. In any case, you will always have access to previous builds should you need to work on older files.
Best,
Paul