We have put this out several times since the initial release of this patch in test and DB.
Players are only required to maintain the one copy of the client and one PTS client, which live client you maintain is purely up to you as you only need to have ONE COPY on your hard drive, your logins will of course be maintained by you as well.
And to be quite frank @iDuckman it would be a VERY good idea to uninstall early so the client doesn't try to update multiple clients which it does not NEED to do anymore.
-Hapa