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Clicked a million times and it turned the Download button in to a Downloading button.

Hover over Launchpad icon on Dock or open Launchpad for progress.
 
fresh install option? new SSD going in my MBP today.

TRIM will automatically be enabled on the SSD, so put in the SSD under a fresh install of mavericks and download TRIM enabler to disable TRIM. Then from there update to Yosemite and then reenable TRIM.
 
I had the PB on an external USB, so as I am running 10.9 off the internal, it (finally) just grabbed the new file. .5GB complete. 30 min remaining.
 
My internet worked long enough to watch the keynote and is down now. May be a good thing
 
Working Now

Hey guys! It works now!!! No throttling!! At maximum speed of your internet provider!
 
Best to wait until the first one or two incremental updates gets released before upgrading.

Speaking from tortuous experience here!
 
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