While attempting to download and convert .ARF recordings the user might be prompted prompted for Webex account information.
MIT site URL is "mit.webex.com"
You can enter your site URL and any text into the Account Name and Password text boxes. A new window will be opened to allow SSO authentication. Once authenticated, the plug-in will be downloaded.
Downloading a network based recording https://cisco-support.webex.com/articles/en_US/Usability_FAQs/WBX28926
Converting a network based recoding https://cisco-support.webex.com/articles/en_US/Usability_FAQs/WBX54330