If you have the 4.5 prerelease it would most likely be similar to the actual release but definitely several builds older than FB/sdk release. You should remove the prerelease version then install the release version.
Thanks, I did that and installed the new version. there are quite a few changes since my previously working code is no longer working...
If anyone have a good resource for what was changed between the burrito preview and the official release it will be very helpfull.