Hiya!
The good old “Hotfix Releases” are now called EE Maintenance Releases, and only available to corporate users with an OpenNebula Subscription: https://github.com/OpenNebula/one/wiki/Release-Policy This is part of our policy to provide more benefits to those organizations that actively support the OpenNebula project: https://support.opennebula.pro/hc/en-us/articles/360043961492-OpenNebula-Subscription-FAQ
For users of the OpenNebula Community Edition, we’ll regularly be producing CE Patch Releases (like the recent v.5.12.0.1), whose code and binary/source packages are available under Apache License v.2.0. As for requesting access to our private packages template repo, please refer to Towards a Stronger OpenNebula Community