Contact NCSoft Support at help.ncsoft.com, they can help you troubleshoot internet/network problems that would cause a patch download to fail.
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Just got a new mac and I have the NCsoft launcher downloaded and installed. Trying to patch the game and the downloading window opens and starts but stops and random points and the download wont continue and the only i option i have it to cancel and start over. The first time it got about halfway, canceled and tried multiple times but it keeps occurring. Any solutions?