I have few versions of Spark stored on Openfire server but actually marked 2.5.8 as active versions. Unfortunately when following download links users are given option to download latest in the set, in my case 2.6.0 RC1. The odd thing is they are never given option to download “_online.exe” ones. Currently on Openfire 3.6.4 but noticed this behavior on 3.7.0 Beta as well.
You can test what you will be given to download directly from my server and below is a list of currently stored versions (2.5.8 set as active).