Thanks for your post. There is a bug in the Addin where it fails to load if Team Explorer is not installed. If you answer "No" to the dialog then the Addin will be disabled and you will not see the error again.
In the future, if you install Team Explorer and want to use the Team Build Addin then you can go to Tools -> Addin Manager and enable the "FinalBuilder Team Build Addin" entry.
We will have a new build with a fix for this bug out ASAP. Apologies for the inconvenience.
That’s correct as well, although if you just say “No” then the Addin will still be disabled (just not removed), so you won’t see the error dialog again.