Actually, it's still there, but you need to check later in the day. Sometimes Partner Program files are in the archive early in the morning, usually by 10:00 AM Eastern, but sometimes much later.
I just keep trying every few hours until it gives me all the files.
Then I do one of those geeky things where I compare yesterday's download to today's to see what earned what.
That won't show the same amounts as Martin's extension. It took me quite a while to figure out why, but it turns out that Medium moves earnings around. Your story from Thursday may have fifty cents moved from Friday to Saturday or vice versa. Why? I have no clue, but tho at's what happens, so since the Partner Program files are fixed in time and Martin's grabs data when it runs, the figures will vary.
Nothing to worry about, it all sorts out in the wash and I haven't noticed money being moved after a few days, so older stats stay stable.