'Could not load the brushes....'

I just downloaded a brush file from somewhere online, and it's a .abr file like every other default brush in my selection, but it still says "Could not load the brushes because this file is not compatible with this version of Photoshop". I have Photoshop 7, and this has happened every single time I've tried to download brushes. How am I supposed to tell if the brushes are not compatible before downloading them? Is this normal? They work on CS2, but I don't like using that program.

Please help and thank you.
--Clara

The brushes won't load in Ps7 if they were created in CS, CS2, or CS3, because those programs have more brush options, so the files are not backward compatible.