This is not required any more, you need upgrade your firmware to the version +4.09 using ElGato Cammera Hub
https://help.elgato.com/hc/en-us/articles/4406041241997-Elgato-Facecam-Firmware-Update
- Added MJPEG as a fallback video format. MJPEG requires less USB bandwidth and improves compatibility with programs that cannot handle uncompressed video.