Site Crashed

When updating the version of Live Composer the entire site crashed and gave the error ‘Parse error: syntax error, unexpected ‘[‘ in /home/p153j5vk/public_html/wp-content/plugins/live-composer-page-builder/includes/scripts.php on line 419’
Now I cannot login with my username, I cannot access the WP Admin side, and the entire site is down. Please tell me there is a way to revert the site to the previous settings! I’ve seen links to submit a ticket on the Live Composer but for some reason my login credentials are not working and doesn’t recognize it as a user when I try to reset the password. Please help!

The page I need help with: [log in to see the link]