Wt 4.7.1 is a small patch release that fixes a couple of issues. Check the release notes for more info.
Here are the links:
Wt 4.7.1 (C++): download wt-4.7.1.tar.gz (release notes)
JWt 4.7.1 (Java): download jwt-4.7.1.zip (release notes)
Binary builds for Windows are available on the GitHub releases page.