Right now you cannot play even with the current downloaded version. Read the stickied thread in \"Crystal Blue Problems/Bugs\" for more details.
I will make a new release just as soon as I can (everything *seems* to be working well enough) There will be messages here and on the website when that happens.
It does sound like what you downloaded was corrupt. At what point did you get this message? Before or after agreeing to the license and installing the program?
Thanks,
Daniel