On December 6, 2021, Sony released a firmware upgrade to version 2.00 for the a7C camera. The upgrade is available for Windows and Mac computers through the following link:

https://www.sony.com/electronics/support/downloads/results?query=ILCE-a7c

According to the information posted by Sony, the upgrade offers the following benefits:

Benefits and Improvements
Adds the USB Streaming function to allow connection using a USB cable to a PC for live streaming and online communication with high-quality video and audio.
Note: When connecting to a device with a USB Type-C port, use a commercially available USB cable or terminal conversion adaptor.
Makes the Eye AF feature compatible with animals when recording a movie
Improves the operational stability of the camera
Note: Refer to the Help Guide for details on all updated functions.
Previous Benefits and Improvements
Fixes an issue where the information displayed in the viewfinder may not appear in the correct position.