This just means that MegaUpload is not able to let you download the "whatthisis" text file at that moment, and that you should try again soon.
That is all.
And for remindering, here's the link:
"...and I say this as someone who watched Eddie and the Cruisers and The Philadelphia Experiment willingly."
"You know Yoda smoked weed at least once." ...hi. Welcome to a weekend. I hope it's a really relaxing one. We all deserve less stress.
"It would feel much different if his name were Jerry Dresden." (Oh, okay: The Dresden Files official page)