I’m sure this has been mentioned before but when you click on a download from the download centre, when using Chrome and/or Firefox you are asked to accept the EULA. Once you click “Accept” it directs you to an insecure server (http:// rather than https://) and thus Chrome and Firefox both block the files saying they are insecure.
I’m just pointing this out as there are ways around it (until it’s fixed) if you know what to do.