Convert .MOD files on MacPro

I haven't used anything for years since my cameras, etc. are newer so I don't run into that problem any longer. I don't know if Handbrake is still available and/or works with your OS version; you can check that out.

https://handbrake.fr/

My favorite one is no longer available.

you will need a video converter to do what you want. Try the app store or google for it. Make sure it's compatible with your OS version.