Why not just send users to ryandor.com which is a map building site? That's where most of these files came from, and they aren't offline and never have been for any extended period of time during the past 5 years or more. Things are slow over there, seems to me it would be better to promote sites like Ryandor instead of pushing traffic for their files elsewhere.
http://uo.orbsydia.ca is the other major map editing site. Offline right now but I'm sure its only temporary.