Posted in Magento download https://www.magentocommerce.com/download
For Versions 220.127.116.11 through 18.104.22.168
Per announcement email sent yesterday from: Magento <firstname.lastname@example.org>
DOWNLOADING THE SECURITY PATCH
Patches are available for Magento Community Edition 1.4 and later releases and Magento Enterprise Edition 1.7 and later releases. Before implementing this new security patch (SUPEE-6788), you must first implement all previous security patches. This will ensure that the patch works properly.
According to this, patches will be available for:
CE 1.4 and up
EE 1.7 and up
All I see on that link is downloading a version of Magento and some other links, where is the actual download for 6788?
The issue is that when you arrive from "Notifications" page where Critical notifications are listed, the link should put you at least to the patch list page if not right to the specific patch download ... you don't see it in the downloads page and that's confusing and time consuming to try to find it.
To find this patch go to "Releases" tab, scroll down and you should see all patches listed...
You can directly access SUPEE-6788 patch via following link https://www.magentocommerce.com/download#download1750