I don't know if you need to sign on to read threads.
Basically, Go to www.gametribe.com, go to the downloads section, click on DOMO, choose gamershell, choose one of the two EU servers, wait a few seconds while the download loads, click it when it's loaded and download. Couldn't actually be simpler.
I know I had trouble, but thats because DAP was asking me for a password, so I switched DAP (download accelerator plus) off and hey presto, it worked!
It's the closed beta client, but it doesnt seem they've actually changed anything as the patch took all of 3 seconds.