I've never heard of brewsmith.
But if you're talking about beersmith, you need to download the thomas fawcett's grain extension. It's in here: http://beersmith.com/beersmith-1-4-support/
Brewsmith, beersmith, bumsmith, I've been having a few this afternoon. Unfortunately I can't download anything due to lack of intelligence.
Thanks anyway,
Cadbury
Or if it is BeerSmith you're talking about then use the add ons tab in beersmith and download the file that way.
By the way, phoneyhuh was trying to help.