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As stated above we need old Jomsocial versions (2.2.5., 2.4.3., 2.6.3) to update to the latest version.
Since all links and references to the files are dead, we would like to ask to email them to us or give us the current links.
Can you send me an emailto paul AT ijoomla DOT com and i will reply with the versions, i wasn't sure if the registered email was the one you want them sent to