please, take a lokk at this link: https://jira.atlassian.com/browse/JRA?selectedTab=com.atlassian.jira.plugin.system.project:versions-panel&subset=-1
How you can see by the 5.2.11 version is not filled any release date(This will be the final release in the 5.2.x series.). So I think this version is not released yet.
Part of our release process for a new minor JIRA version is to upgrade jira.atlassian.com and let it run there for a few days before releasing to customers. It's already gone through extensive testing, but this is just as a final sanity-check to be confident that the release is good.
If it's on our public instance, rest assured that it'll only be a few days before it's available for download.
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