Give Camera Live[1] a shot. Canon's own software doesn't support my ancient Rebel TSi so I have to use this one instead, but it's worked really well for me. It connects using Syphon so matching up architecture shouldn't matter (and it works under Rosetta).

I use Syphon Virtual Webcam[2] to feed to Zoom, but you can also use OBS.

[1] https://github.com/v002/v002-Camera-Live

[2] https://github.com/TroikaTronix/Syphon-Virtual-Webcam