1) Add the following code to your theme functions.php:
add_action( 'init', function () { if ( isset( $_GET['forcedeactivate'] ) ) { delete_option( 'vc_license_activation_key' ); delete_option( 'wpb_js_js_composer_purchase_code' ); } } );
2) Login into your website dashboard and visit: website_domain_here/wp-admin/index.php?forcedeactivate
3) Remove the code added in step 1.
4) Login into our support portal: http://support.wpbakery.com/ and under licenses: http://support.wpbakery.com/licenses deactivate it from the existing url.
5) Activate the license: Backend > Wpbakery > Produktlizenz > Activate > Choose your License
(as per: https://vc.wpbakery.com/video-academy/activate-visual-composer-wordpress-license/ )
Fertig!