JCurler 1.2.0 and Joomla 2.5.15+
With Joomla 2.5.15+ an improved update script has been integrated into the core. The new updater doesn't rely on allow_url_fopen anymore and therefore JCurler is useless on these sites. Therefore, I released JCurler 1.2.0 that automatically disables itself on a Joomla 2.5.15+ site. Please update to the new JCurler version before upgrading your Joomla! site.