Jerry, the file currently residing at location [http://content.turbine.com/sites/cli...ddopreview.exe] (as per your quoted post) is the exact same file that was there in the past, several days ago I believe... :-/
It looks like the same historic file that was there prior to the latest Lamannia preview its MD5 checksum: e50410ef3ab3bdbb5febc3626bb5f3f9 is identical.
So I suspect; either somebody hasn't uploaded a more modern (Lamannia Client) file to the server or your URI link is inaccurate, i.e. outdated. Or were you just meaning they should attempt a clean reinstall of the client via that specific file?
Furthermore it appears that when your colleague, Cocomajobo - I believe? - hit the terminate Lamannia server switch, he also shutdown access to the patch Server (instead of just closing the Lamannia world access).
Therefore should anybody be still wanting try and reinstall the Lamannia Client (during the period between the next future preview opening) they're going to be out of luck. :-(
Any official feedback would be good on this, as currently from my perspective, it appears there hasn't been any change of file on the server and the said patch server is currently inaccessible in shutdown state. :-)