Shibboleth Service Provider 18.104.22.168 Windows Service Update
A service update to the Service Provider for Windows is now available  to deliver updated versions of OpenSSL and libcurl to address a number of minor security issues, primarily a large set of curl fixes released yesterday. 
The specifics are documented in the release notes page .
This release replaces the original 2.6.0 installers for new installations and can be used to update existing installations.
As a sidenote, the RPMs supplied for libcurl on RHEL 6/7 have also been updated.