So I had this error during Phase 4, never could get it to download. After Beta, I deleted the client completely, then re-downloaded/installed with Early Access key and am now getting it again. It comes after downloading and during the installation of the first patch file from 8.10.2013.

Here is the exact error:

"Unable to update patch files.
[11006][20814][20831][19900][-2147418069]"

Please help ><