The actual installation procedure takes less than two minutes on most sites. Kunena is a Joomla component and it is installed like any other Joomla extension using the Joomla installer.
Upgrading software is not something to be done impulsively. It requires good planning and site preparation. The key to a successful and trouble-free upgrade of Kunena depends on having a solid Joomla foundation upon which you can build a web-based discussion forum. This solid foundation relies as much on your own understanding about how to install Joomla extensions as it does on having a dependable hosted environment.
It is important to create a backup before the upgrade. Also create an additional backup of the Kunena database tables and the /media/kunena folder!
An upgrade to K6.1xis only possible from the Kunena versions K5.1 and K5.2
These steps have always worked in tests to upgrade from Joomla 3.10 to Joomla 4.x and Kunena 6.x
The forum should now be ready. Finally, check that everything is in place and working.
Upgrade from Kunena 6.x to a higher version of Kunena 6.x are the same steps as here: Upgrade
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