For anyone using DPP. it may be worth updating. It now has HDR (for 3 images) and stacking.
Need to pick operating system and OS version under Drivers and Software here ... http://www.usa.canon.com/cusa/consum...ersAndSoftware
Then look at software and find DPP 3.13.0
Sorry that I can't get a better link. You'll figure it out.