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Are you in the Beta program or wanting the public release version ?

IF in Beta then check purchased then updates of MAS .. Public release check the featured tab of MAS for the link of El Capitan download link..


if it says downloaded then the installer for El Capitan is already in your downloads folder waiting to be installed ..
I'm not in beta. Nothing in the Updates tab. Nothing in my Downloads folder.
 
Okay feeling like an idiot. It was in Applications. I expected an install button from the purchase tab like everything else.
 
FWIW, it's only noticeable during os update etc,
I suspect it has something to do with Fusion drive as some system files are located on the HDD.

Doesn't affect daily usage though, so it's not too bad.

I take it back, just installed 10.10 on a fully SSD Mac with Yosemite fresh installed.
Still took about 25 mins or so I would say a fusion drive with 1.5TB files is not bad at all.
 
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