Ninja Just found out that the xml-file on your server (which is called by the joomla update checker) does not provide up-to-date information for ja-extension-manager, thus I had to manually update ja-extension-manager first and then upgrading the templates worked through the ja-extension-manager. You should check all your products (JA-Ext, T3, purity III, ja_simpli etc.) to have up-to-date files on your update-server so our joomla installations can be automatically triggered for such updates. It is a lot more convenient to get notified through this when a system component can be updated.