http://d8yjolse1mixx.cloudfront.net/
everything newer than 5.2.2 is missing.
Installer creation is not automated and so they fall a little bit behind the creation of WARs, JARs and updaters.
We’re working on automating everything we can in the build pipeline so a more real-time installer creation process is on the roadmap.
Maybe add a note to that effect on the downloads page? Rather than make it seem like user error?