If you make them in 8.0 they will not be compatible with 7.0 or any lower versions. Whatever version you make them in, the will not be compatible with lower versions, but they are compatible with higher versions. You could always make an image pack for lower versions of PS and people using other programs.
i am having trouble getting it to work with 7.0. i have 8.0 i'm not sure why the version difference would be that much of a difference that they wouldnt work together. i have 7.0 on my PC and 8.0 on my Mac so0o i'm working on it. if you download 8.0 through a site like limewire i can give u my serial number.... i'm going to try to get some made on my 7.0 as well.
Thanks for the brush. :3
Also, thanks for your support of our troops!