Look no further if you've been searching the web for a digital download of Canon's Digital Photo Professional for Mac -- for use with your Canon 7D. Seems like if you don't have the original CD that your camera came with, you're out of luck because the downloads available from Canon.com all seem to be Updaters and not the actual software itself. Therefore, when you try to install the Updater it asks you to locate the original software (which of course, you don't have!)
Thankfully I figured out a solution. What you have to do is download the "EOS Digital Solution Disk Software" available HERE from Canon.ca. First, click "Drivers, Software, Downloads" then choose your operating system.
If you're using Mac, after download completes open the .dmg file and you'll be prompted to enter your product's serial number. The Canon 7D serial number is located at the bottom of the unit beside the battery compartment (pictured above). Then, select "Custom Installation" to choose the specific software you want to install.