The github isn't updated currently, I've also asked the dev about the update of the source code
Maybe there is an issue with the dns.
Those are the current links to download
https://static.getaether.net/Releases/Aether-2.0.0-dev.5/181...
https://static.getaether.net/Releases/Aether-2.0.0-dev.5/181...
https://static.getaether.net/Releases/Aether-2.0.0-dev.5/181...