It is the Public Beta that you can enroll into! https://beta.apple.com
Thanks
scoopz any update regarding the newest release? any change to your machine?
edit: never mind you already tried it (Beta 6). So I can see that this release is solving graphics issues to some users only and not all of them. hmm what does this mean.. Software + Hardware ?
who else downloaded the beta 6 and solved his issues with graphics?
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