Hi sorry for the late response, please load Gaucho1.0 in Pharo1.0 or Pharo1.0 core.
If you look at the details, i specified the Pharo version Gaucho1.0 works on.
Sorry for the inconvenience, maybe the page should say it more aloud.
Hope you like Gaucho, i'm releasing Gaucho1.1 very soon. It has many improvements and enhancements!
Fernando