After installing the EOS Digital Solution Disc and updater for DPP to my new Mac, all seems to be fine except for one thing. I'm unable to transfer files from camera to desktop. Connecting the switched on 5D (first version) to computer brings to the screen EOS Utility Launcher / "Connect an EOS camera", with a button bottom left that says "Pairing over Wi-Fi / LAN". When I click on that it brings up a box entitled 'EOS Pairing Software'. Headings there are 'Camera model, MAC address, IP address'. Below that is a button that says Connect. But the button doesn't open, and box doesn't allow me to enter anything under 'Camera model, MAC or IP address. What do I still need to do to transfer files to the desktop? Thanks in advance..