Joomla 3.8.10 is available to address the autoloader bug introduced in Joomla 3.8.9 that affects Window servers. If you are using a Windows platform, please update your site to 3.8.10 as soon as possible.
» View for more information about this issue here.
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Please read the update instructions before updating and remember to clear your browser's cache after upgrading.
Note: SmartAddons' Joomla templates can work with this latest Joomla release. You can update them to Joomla 3.8 and follow this article for Fix Bugs, Errors When Update Sj Templates to Joomla 3.8 for bugs fixing or contact us here, we will help you.