Apache Celix only releases source distributions, information about building and running van be found inside the release tarball.
The currently selected mirror is https://dlcdn.apache.org/. If you encounter a problem with this mirror, please select another mirror. If all mirrors are failing, there are backup mirrors (at the end of the mirrors list) that should be available.
You may also consult the complete list of mirrors.
Following the steps described here if you want to verify the integrity and provenance of the software.