Can you please let us know the ticket numbers so we can look into this? Also even if the ticket states that it is "solved" you can reopen it again to speak with another agent by replying to your email!
This problem has been here since release. One of the reasons that made me quit, having to repair each frecking patch. But came back 2 weeks ago think now we can play. But no no no no, repair repair.I don't want to criticise the moderation, but why has this thread here been closed: http://forums.elderscrollsonline.com/en/discussion/145601/error-210-patchmanifesterror-downloadfail/p1
It is the oldest one of them all (january) and also provides some helpful tips from ZOS_GaryA, while in this thread here there is almost no official answer to the topic at all.
If you have trouble, please look there and try out some of those tips! Then also always try to run the game via eso.exe. That almost ever works.
I suspect the problem lies with ZOS's CDN, which will explain why some people work and others don't (And why it does work sometimes for me and not others).
As a suggestion, close the launcher, change your DNS to Google's one (126.96.36.199) and see if you have more success. If so, it kinda proves it is a CDN-type issue (I know I haven't had it again since changing my DNS, however that could be a coincidence).
Just try to restart the Launcher after closing it.
I do get error 210 most times, i start the Launcer. If the Launcher allows me to play, i do have only some time to click on play, before the Launcher means 210 again and want another repair.
I did more than one repair and the launcher popped some 210-error messages while "repairing" (more than 1).
So i'll keep restarting the launcher for playing the game.