Also can't get the download to work - even after turning off anti-virus and using 2 different browsers (Chrome and Brave).
Ok, for future reference. This has nothing to do with anti-virus.
It has to do with the SSL certificates not being verifiable. The way around this - and to check what I am saying - is to right-click the link and then "Save As" - this is only for people who are having this issue. Damned if I know why some people aren't have that issue, but perhaps they have zero security checking for SSL certs.
Under the downloads tab it will then tell you it held that download up because the site was not verifiable. And you can click "Download anyway"
This is why no such error occurs for people when they use the alternate download sites for 1. 13 - because Mega doesn't have that problem. It clearly has nothing to do with the file - because anti-virus would flag it no matter where it came from.