Open Battery 4 - go to File - point to Battery 3 library kit folder - open battery 3 Jazz Brush Kit.
no problem. assigned cells and each loaded really smoothly and quickly. all sound fine.
I think cause I had Battery 3 installed when I installed Battery 4 it only loaded the new kits into the battery 4 library folder. all my Battery 3 (battery 1, 2, 3) all are there and all load no problem.
I'm not finding any problem. though now I might have to merge folders or something cause not I have tons of folders to go through. but the file browser is quick and easy to navigate. I just loaded 2 different Battery kits - one a v3 kit and one a v1 kit.
no problems here. BTW Battery 3 still works and runs so I can always go run that too.
I don't know why I would go back. I love battery 4 interface much much better than battery 3. it's easyer for me to understand and see what I need to get to.