Hmmm...BBM .52 is for 5.0 OS only according to the reports I've heard.
If you are not running 5.0 you get an error on install saying that the COD is incompatible.
It's a bit of a risk. I am not speaking for everyone, but the first time I bricked my Tour, it was due to the fact that I tried downloading latest BBM onto my 4.7OS.