Comment #6 on issue 3982 by [email protected]: Error: can''t find EOCD position
http://code.google.com/p/pharo/issues/detail?id=3982
This is what you see when squeaksource returns an error- I'm down page, and monticello tries to read that page as a zip file.
If you encounter it again, wait a bit, then try upgrading again.
