No release in years: https://github.com/maruos/builds/releases

It looks like it is on maintenance mode: https://github.com/maruos/maruos/commits/master/

It does look like either the OS or the website have fallen behind.

Last release on GitHub was also 2019. Repository's seen activity since then, last thing I see is some documentation and GitHub actions committed in 2023, and there's dependabot activity all the way up to 2 weeks ago.