OK...
The new version has been released. Everyone should update.
Please note: it is possible that you get an error box when you install, updating from 16x versions. Just restart Messenger if you get it. Also, Hopper may not be loaded after you update. If it is not, please manually activate it in Plus!\Preferences -> Plugins.
Before reporting another bug, please make sure it's raised by Hopper. That is, uninstall Hopper, restart Messenger and see whether the problem is eliminated or not.
Josh: Your Messenger could crash when you update. But that's not caused by Hopper