Thanks for the clarification.
The links on the right side are for navigating between the versions; as the default landing page on previous versions is for version 12, there is no other page to load when clicking 'version 12.x' on the right. As such, the page does not change when clicking '12.x' on the right.
Rest assured, all downloads on the previous versions pages are the latest available for each version.
Hope this helps!
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