The edX support policy is that the latest Open edX release is the only one that is supported. So as of this moment, Ironwood is supported. This means that we will fix problems with installation, security, or data loss.
Hawthorn (and earlier) are not supported. Yet people still want to install those versions. What can we do when those installations stop working? @lpm0073 has opened a pull request to fix Hawthorn in light of numpy dropping support for Python 2. edX doesn’t have the resources to verify this fix, which is why we only support one version. What does the community want to do to keep old releases working?