The game isn't available for download. My guess is that you downloaded the beta client, which would cause a version update to fail. A physical copy of the game has to be purchased; there is no digital copy like most other new MMORPGs.
Many posters here have said that there are torrents of the game available if, for example, you buy or are given a buddy pass by a friend on-line. However, you're right, the OP may have mistakenly downloaded the beta client.