ZenCache v151004 was released on October 4th, 2015. This release includes 1 bug fix to address a bug that was introduced in the previous release (v151002).
Changelog for ZenCache Pro v151004
- Bug Fix: Fixed a bug introduced in the previous release that was resulting in a "Fatal error: Using $this when not in object context" for sites running PHP 5.3. (PHP 5.4+ sites were unaffected.) Props @jaswsinc. See Issue #581.
Upgrading to the Latest Version
ZenCache Pro users who have configured the Plugin Updater (Dashboard → ZenCache → Plugin Updater) should receive a notification to upgrade on the WordPress Dashboard. If you have not configured the Plugin Updater, you can download the latest version of ZenCache Pro by logging into your ZenCache.com account here. You'll find a download link for the latest version on your Account page. There's also a Release Archive if you need to access previous versions of ZenCache.