How do I save a custom brush set for a previous Illustrator version?

[Boldline]

I have a few brush sets created in Illustrator CS5 or above that I purchased/came across and I was trying to open them in Illustrator CS4 (the version I use) and it tells me they were created in higher versions of Illustrator and data loss may occur if opened...I open it and it does not give me any brushes.
So I am trying to find a way to save the brush set as a CS4 compatible file and have not figured it out yet. When I go to save a brush set there is no "down-save" option to prep it for lower versions of Illustrator. It just saves it out immediately. Any ideas?

[Dottonedan]

No ideas off hand.  I've opened and used old settings in newer program versions, but never tried opening newer presets in older versions. I would check on the actual Adobe site forum to get answers like that. More people have tried there.