They announced a delay late on the day of release.
You don’t know the time zone, these files can come from anywhere. Now just suppose you would be responsable for the downloads and install… and suppose, there would be something wrong with the downloading or with installation procedure itself, found during the day… like downloads that get stuck or reset… It is quite possible you only found the issue, when your server went buzy and the first downloaders start to complain on this forum… in that case, you’d better shut off that world wide update ! unless you wanna loose all players at once…
For anyone (really) worried… just watch this forum for news, then start the game.
(actually I dont know if it went like that… but I’m a developer, there are worse things than a failed install, when the bugs are out… so I would also pull the plug for a few days, postpone… fix the problem, then proceed… use the Store infrastructure to keep people informed etc)