(J)Wt 4.12.4 and 4.12.5 have been released!
(J)Wt 4.12.4 is a patch release that mainly (but not only) resolves an issue where WRadioButton in WButtonGroup were not being updated on the server side.
(J)Wt 4.12.5 is a hotfix addressing a specific bug introduced in the 4.12.4 release.
Check the release notes for more info.
Here are the links:
Wt 4.12.5 (C++): download wt-4.12.5.tar.gz (release notes)
JWt 4.12.5 (Java): download jwt-4.12.5.zip (release notes)
Binary builds for Windows are available on the GitHub releases page.