I just purchased bundle, I downloaded zip file from subscriptions page: JFBConnect-5.0-Joomla30_20130220_unzip_first.zip
and uploaded zip from backend extensions as normal but I get this:
JInstaller: :Install: Cannot find XML setup file
I tried downloading again and uploading again to no avail - same (warning) error. I cannot access any JFB Connect modules yet.
You need to unzip that file that you downloaded first. Inside that zip file, you'll see all of the extensions that are a part of JFBConnect, including the com_jfbconnect.zip file. That's what you'll need to install for the main component.
Full installation instructions, including the unzip requirement, can be found in our JFBConnect Configuration Guide.
I hope that helps, but if you still have issues, please let us know.