VBSEO and Wordpress htaccess in SAME directory

My Wordpress and Forums are installed in the same directory.

Is it possible to use VBSEO without breaking one or the other? Or do I HAVE to move one directory?

Hello,
You will need to use a separate directory if you use permalinks for WP as both operate on a 'catch-all -> script' functionality in the htaccess

no way to do this on the same directory?

It may be possible, but you would need to code your own pre-processor, somehow determine if said content is a wp script or a vb (this will be the hard part), and then include/redirect to each scripts processor.

It won't at all be supported and you are on your own if you chose to go down this route.