ION Core version 5.0.00 is now available from:
https://github.com/ionomy/ion/releases/tag/v5.0.00
For the release notes please see the git repository:
https://github.com/ionomy/ion/blob/master/doc/release-notes/release-notes-5.0.0.md
Preferably use the download link named ion-5.0.0.tar.gz, not the two links named Source code (zip) and Source code (tar.gz) to download the source tarball, as the release tarballs are generated deterministically whereas GitHub's are not.