What is something so special about it that it needs to be password-protected? o.o
You haven't understood, there's nothing special inside, password protection is just guarantee that his predictions have not being changed. You get prediction earlier and nobody can change it.
Not that I think it makes much sense, his predictions are probably childish.
It seems to me that it would make far more sense for the OP to post their predictions openly, here, and then ask someone to quote them (so we know the predictions haven't been altered by the OP). Like other posters there's no way I'm downloading some random binary file off the internet.
If he posted his predictions openly, it may affect the outcome of something. There are cases where you can predict something and want to prove to everybody that you were able to do it, but you can not publish it before the event.
There's no need for everyone to verify the contents of those Truecrypt vaults, we'll see after October 19th if his predictions a) make sense, b) have any real value to everyone, and after that it will be trivial to verify the contests of the files, if it will be worth the effort at all.