Go to the DNG Product Page
. Go to the Downloads in the upper right area and click on your platform. Leads you to the DBG Convert download which also includes the DNG Profiles (that will also work in ACR 4.6).
I will download DNG 5.3, but that still leaves me with this. I have to convert the CR2 files to DNG in order for Bridge CS3 and Photoshop CS3 to recognize/ see the files and that in turn leaves me with DXO Optics Pro unable to read the DNG files... at least at present.
So on the one hand if I want to keep my native CR2 files to be openable in DXO as the first point of call they are not visible in Bridge CS3: on the other if I convert them with DNG 5.3 then they are not visible or usable with DXO.
Its a workflow choice.