Instructions on how to download the beta client plus FAQ links here.
https://www.guildwars2.com/en/news/announcing-guild-wars-2-for-mac-beta/
Here are the specs you need to play.
http://www.ign.com/articles/2012/09/18/guild-wars-2-mac-beta-now-available
Here is the Mac tech support forum.
https://forum-en.guildwars2.com/forum/support/mac
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Solo MMO Player at http://solommo.blogspot.com