Board Thread:Support Requests - Community Management/@comment-9725237-20141009190106/@comment-5518342-20141009200204

Downloading all of the images from one wiki is possible using WikiTeam's Wiki Archiving scripts.

It runs on Phython scripting and you can not only download all the images but generate a wiki dump with it. However, to upload the files to the other wiki, you would have to manually upload them. I recommend using wikia's multiuploader to do so.