After a day of attempts, I finally have a whole Wiki downloaded.  It wasn't
straight forward, but it is not hard.  If you log into your WikiSpaces Wiki,
on the upper left-hand side of your WikiSpace click Manage Wiki.  If you are
an "organizer" of your Wiki, you should have an Export option if you scroll
down.  If you have the Export option, I think you can save the whole Wiki as a
ZIP file.  However, if you are not an organizer/owner of that Wiki, you can
still download the contents by clicking the Web Folders (WebDAV) link.  It
should show a web address something like this:
YourWikiName.wikispaces.com/space/dav and the last two words in that link are
very imporant.  Using WinHTTrack Website Copier, start a new project.  On the
Add URL option, paste in your whole WikiSpaces address with /space/dav at the
end.  Type your WikiSpaces user name in the Login field (NOT your email
address associated with the Wiki... only your User Name will work) and type in
your WikiSpaces password in the Password field.  Click Next and Finish.  Your
WikiSpaces site should begin downloading.  It won't be "pretty" with images,
but it will provide all the files and documents (the text content) of the
Wiki.  Becky