Joomla (2.5.18) does not recognise latest maintenance release (2.5.28)

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I have a joomla site that is still running on 2.5.18 and I would like to update it to the latest 2.5 joomla maintenance release, which is 2.5.28.
However in the joomla backend
- at Components > Joomla Update,
- in the Control Panel > Quick Icons, and
- at Extensions > Extensions Manager > Update tab
it is saying that Joomla is up to date.
I already tried to Purge Cache in the Update tab of the Extensions Manager.

Please advise what can be done to have Joomla 2.5.18 recognize that the latest version is 2.5.28 , so that a one-click update can be performed from the joomla backend.

Thank you.
Hello, Thank you for contacting us about updating your Joomla installation. The steps you have already performed are what I would have recommended, and what I would do if I were in your position. The Joomla documentation confirms those are the correct steps, including clearing the cache. I advise contacting a Joomla developer who may have encountered that error before. Best, Christopher M.