I have just installed the latest update and am getting::
AH01071: Got error ‘PHP message: PHP Fatal error: Uncaught Error: Call to undefined function IndexWpUsersForSpeed\update_action() in wp-content/plugins/index-wp-users-for-speed/includes/instacron.php:29\nStack trace:\n#0 wp-content/plugins/index-wp-users-for-speed/includes/instacron.php(35): IndexWpUsersForSpeed\need_cron()\n#1 wp-content/plugins/index-wp-users-for-speed/includes/plugin.php(74): require_once(‘/home/w…’)\n#2 wp-content/plugins/index-wp-users-for-speed/index-wp-users-for-speed.php(94): IndexWpUsersForSpeed\Index_Wp_Users_For_Speed->__construct()\n#3 wp-settings.php(467): include_once(‘/home/w…’)\n#4 wp-config.php(182): require_once(‘/home/w…’)\n#5 wp-load.php(50): require_once(‘/home/w…’)\n#6 wp-blog-header.php(13): require_once(‘/hom…’