This isn't really anything to do with Paragon Chat.
To answer the question, Sentinel+ was only for the Live Servers at the time the game shutdown. In the current state, Sentinel+ will not work on any of the servers running now.
Please keep the Sentinel+ files. (The XML ones of your toons from live.) Because
the updated Senticon works on them now, and we're exploring other options for importing data from them. As for the tool itself, sorry. No plans at this time to update Sentinel+.