The easiest way to stream a live WebEx meeting to your HyperCaster is to stream the WebEx to Facebook Live, and then configure your HyperCaster to play and/or record the live event directly from Facebook Live.
As a best practice, it is also highly recommended that you record the live meeting to a file locally. WebEx allows recording a meeting to your computer. This provides a backup recording in case there are any issues with recording the live stream, such as networking problems, or congestion over the Internet that may cause some dropouts. The locally recorded file can be uploaded to your HyperCaster after the meeting is finished, and will provide the highest quality copy.
As an alternative to using Facebook Live, you can use OBS to stream the WebEx viewer application window running on a dedicated computer directly to your HyperCaster.