I just downloaded them all and see the issue also. It's the requested hotfixes that are having problems. Normal updates are ok. As Enthousiast said, the links are all official MS links, but those requested hotfixes are routed through a different domain (hotfixv4.trafficmanager.net vs. download.microsoft.com). hotfixv4.trafficmanager.net is the official MS domain for them and it's down at the moment apparently. The old domain of hotfixv4.microsoft.com for them is not working either. I think abbodi1406 posted previously that MS is slowly killing access to the requested hotfix system and this may be another sign that it's going away at some point. Maybe abbodi1406 knows more about this.