The YahooDataDownloader appears to work nicely.  Is there a similar tool for creating the factor files?  It appears the necessary data is available via yahoo. For example. http://ichart.finance.yahoo.com/x?s=AAPL&a=00&b=2&c=1962&d=04&e=25&f=2016&g=v&y=0&z=30000

If said tool does not exist, does anyone understand the spec of the factor files? Or more importantly the math required to do the conversion? https://github.com/QuantConnect/Lean/blob/master/Data/equity/usa/factor_files/aapl.csv

When comparing the two samples of data from above I also noticed the 7:1 Split occurs on Jun 9 for the yahoo data but appears to occur on Jun 6 in the factor file.  Not sure it matters, but maybe someone has an explanation.

Thanks!