had a similar issue - unable to find the client download after a new server install,
discovered, on initial install of the server the downloadable client app does not exist even though the link does. Results in "web page not found" when clicking the link from the admin panel which display the download page but the "download" link is empty, and an empty folder on the file system.
after running through the admin panel "protect my network" wizard the downloadable client file suddenly appeared.....
suggests the initial wizard must be run from the admin panel before the file becomes available - the link and page is available but no app.
anyhow thought it might help somebody
cheers,