I've tried installing the Canon software that came on the CD with my 5ds on a Windows 7 64bit machine. Also tried the latest version of the software from Canon's website on Mac OS X.
In DPP4, clicking on 'Remote Shooting' launches EOS Utility (if it wasn't already loaded), but then says 'EOS Utility is not ready.'. Looking at Utilitiy's window, it just says 'Connect an EOS camera'. The camera is connected and displaying a computer icon on its LCD, and Windows/Mac OS both detect an attached camera, allowing basic image-transfer functions.
Does Canon's own software for their own camera really not work with it?
Solved! Go to Solution.
I can only see an updater for it on the MkIII page, not the full thing.
Download the Digital Solution Disk 29.1a and install DPP3 from it. Then apply the latest update from the Web site. Normally you'd have to install EOS Utility V2 as well; but you must already have that, or you wouldn't be able to even try DPP4.. (It's included in EOSU 3, without which I don't think DPP4 will run.)