Hi @fixxit91
The tab styling classes are only for the WS Form framework. They are not available for Bootstrap or Foundation. If the demo form you downloaded is not working it suggests you are either using Bootstrap or Foundation in your theme, or your theme has CSS that is overriding those classes.
You can check which framework you are using by going to WS Form –> Settings –> Advanced.
If you are using the WS Form framework and require further assistance, please feel free to send an export of your form to our support team via our support page here:
Many thanks
Mark