The Kunena team has announce the arrival of Kunena 6.2.6 [K 6.2.6] which is now available for download as a native Joomla extension for J! 4.4.x/5.0.x. This version addresses most of the issues that were discovered in K 6.1 / K 6.2 and issues discovered during the last development stages of K 6.2
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earl wrote: Does anyone know if it would be possible to adapt the Kunena latest add-on to draw from a different joomla installation.
Short answer: not possible ...
unless ...
you substantially rewrite the Kuena Latest module and changes which database to look at and will pass the appropriate security protections on that other site. If the two websites use the same Joomla database then this minimises the problem a little but not a whole lot.