There's no file in JFBConnect that should be anywhere near 20MB. Our whole package, with hundreds of files, is like 2.3MB total. If there was a file that large, either a) it wasn't from JFBConnect or b) it had been altered in some way.
If the file was that large though, I can understand why it may not transfer. Some servers have restrictions on how large of files can be FTP'd and it's possible you were just running into that restriction.
I hope that helps explain. If you do find out it was a JFBConnect file, please give us more details. We're very curious as to what could have caused the file to inflate. None of our files should ever grow.
Thanks,
Alex