Below are links to the published Windows Zip N Go versions held on the SourceForge mirror at heanet.
If like me you found the backlevels hard to find this is a useful place to find them.
ftp://ftp.heanet.ie/pub/sourceforge/p/pb/pbwebgui/
All the old WebGUI sourceforge released packages are held on this page.
If these are not available I have copies available on request.