sharat87/coursera-downloader — pull request #2 by BenBallard (2013-01-06 06:18:44+00:00)
Title: Download file size not found.

I also ran into an issue with download sizes not being found for some reason. It seems that these can be disregarded and the download still works. The bug seems to occur on smaller files, not the movie files. I am not sure if this is the correct way to handle it or not, but the downloads keep happening which works for me.