Without knowing exactly what is or isn't happening, it's very
hard to help.
However, try checking out the project manually in Subversion
(I assume that's possible, never having used it) then opening it in
Robohelp. I had a few problems with files not being checked out and
thus not upgraded properly, although only with some projects.
If that isn't the issue, post back with a detailed
description of what you are experiencing and someone with
Subversion may be able to offer more help.