Hello Simon Moorhead,

It is important to take note that upgrading from major releases from versions 3.8.x or lower to 3.9.x, requires a manual upgrade via the Extension Manager. It is not possible to do this via the Updater. Please be rest assured that the normal upgrade process will not erase your blog posts or settings. Hope this help.

*Notice : Remember backup your customization file before update your latest version of Easyblog.