In the CAST Highlight Web page when the Application results report are  exported the link sent  to the registered email address of the user are SAML links.

Though the user is a non-SAML login user, the email link received is a SAML login link.

Workaround or Action Plan

If your organization is configured for SAML, receiving the SAML download URL link in the email for the report  is an expected behavior.

The links generated are based on how the organization is configured, either over SAML or the traditional mode. If it is a SAML configured organization, even if the user is a non-SAML user, when the user downloads the report, user will receive a SAML link.

However, classic users can eventually replace the URL as follows:
<https://{server}/#Export/PPT/download/2162123455>
Instead of <https://{server}/saml/login/alias/<company123>

Additional Resources

CAST Highlight Troubleshooting Guides

CAST Highlight Product Documentation

Zendesk Ticket Number 

42956