Disable Visual composer nasty auto update functionality that won't let you update the plugin from TGMPA. A quick snippet that can be dropped in your child theme functions.php

fix-for-visual-composer-update-with-tgmpa.php

/* Disable VC auto-update */
function seventhqueen_vc_disable_update() {
    if (function_exists('vc_license') && function_exists('vc_updater') && ! vc_license()->isActivated()) {

        remove_filter( 'upgrader_pre_download', array( vc_updater(), 'preUpgradeFilter' ), 10);
        remove_filter( 'pre_set_site_transient_update_plugins', array(
            vc_updater()->updateManager(),
            'check_update'
        ) );

    }
}
add_action( 'admin_init', 'seventhqueen_vc_disable_update', 9 );