An issue was found on the last JACK2 release that caused a few applications to crash on start.
This is a quick hot-fix for that release. If you are running v1.9.15, please update.

Because of a new release being needed, we took the chance to remove the jack-router Windows code, as it now belongs in its own repository.
These two items are the full release.

You can grab the latest release source code at https://github.com/jackaudio/jack2/releases.

You can also grab the latest pre-built installers for macOS and Windows at https://github.com/jackaudio/jack2-releases/releases.
On other systems, ask your jack2 package maintainer to update to the latest release.