There are several ways to download builds. The easiest for most users is to download a release build, which contains configuration files, scripts and the java binaries:
If you need something not included in the release or need a recent development build, those are here:
Note: these are development versions, they might not work entirely and might reflect work in progress.
However, if you can build from source with bazel, that is usually better. The jars above might be out of date.