I am starting work on an options trading platform. The first thing I want to calculate is the theoretical pricing of options, for which I need the historical volatility.

I have tried to get historical mtgox closing prices from both

http://bitcoincharts.com/t/trades.csv
and
http://www.bitcoinwatch.com/trades.zip

but both are 404.

Is there any place from where I can download the historical closing prices for mtgox?

Thanks!