If you opt to use shinyplastic's recommended strategy (it's the only option I'm aware of), here's the link to the TB8 download:
Hope this helps!
Also, do let us know how the process goes for you....when you get a chance.
In the meantime, can someone confirm whether TB8 will overwrite TB7 or not?
-- If it does, will the TB7 brains be automatically accessible in TB8 -- or will the TB7 brains need to be manually imported into TB8?