You can get 18.104.22.168 beta from Downloads section or following this link.
But if you really want the latest version, you must check the source code control repository. At this moment the last downloadable version (e.g. with SVN client) is 22.214.171.124 beta.
This is the first version that has a real contribution by another developer: Steven Evans. He has provided to HelpText type the ability to word wrap when emitting text.
Thank you, Steven!