Hello,
It is marked as required, but on my test site, the chat works fine even without it.
Read more – https://www.8theme.com/faq/ (I have a message about plugins activation. Where can I get purchase code?).
If the chat is not showing, you need to check all settings or provide me wp-admin access in Private Content, so I could check it.
Do you use Massive Addons for Visual Composer plugin or Ultimate Addons for Visual Composer?
Regards