Well nothing comes immediately to mind,other than making sure both your camera n the software you download are one of the listed cameras on canon's web cam utility page. Try different cables. Make sure you disable the wifi settings on your camera if ...
That is if your camera is equipped with Wi-Fi. Mine is a EOS T7 that has the Wi-Fi Feature which will allow you to connect to your phone. Its a pretty cool feature but the draw back is that it disables your display ports on the side of the camera.
If this is the image you were getting like I was make sure that your cameras Wi-Fi connection is disabled as having the Wi-Fi function on will disable the cameras HDMI, USB ports. Which will prohibit the camera from connecting to your computer. It t...