If I'm understanding you, and maybe I'm not, you want to take GB '11 files and bring them into older versions of GB?
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There's a way to access the most irreplaceble files - control click on the GB file in the finder, select 'show package contents,' and forage through the media folder to find (and then drag into a new GB project if you want) your audio files. Other tracks, e.g. loops, are likely more easy to replicate in a new project.
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However, ideally you'd want to be able to bring older versions into GB '11 and not lose anything, rather than bring newer files into an older version, and lose things.
I don't know the requirements for GB '11 offhand, but are you sure your computer won't run it?
Because GB, like everything, keeps adding new features, there's a simultenous loss of legacy compatibility with older computers. If that's what you're experiencing, it may be time for an early Christmas present if you want to use the new version!