Description
Go to Administration: Add extensions > Search for and select an extension (e.g. Application Manager API) > Show details > List stable versions > Select a certain version (e.g. 5.2.2) > Install application > After that click on "Back to list" Button and you will be sent to the source (xwiki/bin/get/XWiki/AddExtensions?listVersions=true§ion=XWiki.AddExtensions) of the page.