Missing pyWin32, Mark Harmond's windows library for python. I suppose
the installer could check for this and report the missing dependency.  I
have done this myself with DotNet dlls, and some installers give you a
chance to write a routine to check complex missing dependencies. 
Although the easiest way I can think of is wrap an import statement with
a try catch and report either success or failure.  

workaround, before you install roundup, make sure you have install
pywin32 from Mark Hammond's web site.