MASIE is now back online. (Thanks to Ron for a comment heads up – I had been checking intermittently)
No old data yet. Just data from day 112 to day 121.
From 02 December 2014 to 17 March 2015, no data are available because the input data files for that time period are corrupt. When our data provider has reprocessed those data, we will back fill the MASIE data, however NSIDC has no estimated date for when we will receive them.

I did catch a file with older data, including the max reported on day 93. The spreadsheet can be downloaded here:
https://rclutz.wordpress.com/2015/05/02/arctic-ice-watch-2015/