Post Affiliate Pro 4 update For details about update to the latest version read: http://support.qualityunit.com/knowledgebase/post-affiliate-pro/installation-and-upgrade/upgrade-to-the-latest-version.html For details about upgrade from PAP3 read: http://support.qualityunit.com/knowledgebase/post-affiliate-pro/installation-and-upgrade/upgrade-from-version-3.html