We have further changes to the release plan for 5.6.x. Yesterday came and went and as you noticed 5.6.20 was not pushed to the repo or our download site. Today you will notice that we posted 5.6.22 as a stable candidate. It likely will be re-released as stable status tomorrow.
We plan to have an updated release to the repo and download site as soon as possible. Due to the quick release cycle this may or may not be 5.6.22. We will provide dates and times as soon as possible, in the mean time please download the installation packages manually to update your controllers.