drivers and firmware for 5d mark 4

[Photoman407]

which one do I download 

[jrhoffman75]

1. I am not aware of any drivers for Canon cameras

2. the software notes for the firmware downloads describe what they do. You can decide if you want to download or not.

[Waddizzle]

If your camera includes Canon Log, which costs extra, then do not download any of the free firmware updates.  A camera body with Canon Log must be updated by Canon.