No, the app will always be free to use and download. Are you on WiFi when you try to connect to BBM? Are you connected to your mobile network as well?
I have the latest bar here https://mega.co.nz/#!ictFmBqR!BELMjV...6PsjFhg2i3dTz0
, if you want to install it directly on your device. Though, if you got it from Google Play, you should already be up to date.