Error The Digest file is invalid
I have this kind of error when i download a game from site and try to "install" it. Can any 1 can help ;/...?
Well... I got same problem... I just cant download those files... I mean i can but installing is second thing to do... Of course i cant even install the game, because i still see same thing "Unexpected end of file on server". What is kinda fun I had pleased my friend to download full game for me and send me packed game. It was working for 2 days when they updated game AGAIN ERROR. "The digest file is invalid". THIS GAME SHOULD STILL BE BETA !! Its not even completed and what's strange support system is not ready -.- I cant even contact with supporters... Whats more strange: I got same problems with their other products like pirates etc... But everywhere is same problem and none can solve it?
I'm sorry to hear that you're having these problems, but they might have something to do with the way your internet connection is set up either on your computer or through your internet service provider.
Please refer to the Wiki link I posted above, and make sure your firewall settings are all in order.\
If you could provide any more information about your problem, that would also be helpful.
I posted about this problem a couple of hours before OP, but have recieved no help to resolve it. http://forums.spiralknights.com/en/node/2353 for my full report.
The strangest thing is that it has worked once, I got to play through the path to the first camp but as soon as I tried loading up the new area I again got the digest file is invalid error. This leads me to believe that there is nothing wrong with my setup, which I of course also have double checked multiple times.

This is a new error that hasn't bee reported so far in these forums. I'm still trying to figure out a basic probable cause, but you have been noticed. It seems like there's something funny going on with the integrity of the data during download (just my conjecture).
Have you tired flushing your Java Cache just in case bad data wound up in there? I've also had one or two people that solved things by doing a complete Java + SK re-install.
I had already tried the "shotgun aproach" as its called in the trouble shooting guide and it did not help, done it a couple of times in fact. Just clearing the Java cache does not seem to alter the course of events either. I have a ticket with the support team and mailed them back and forth a couple of times but still only getting standard responses and asked to try doing these same sort of things.
I am also having the same issue, was able to complete the first area and have tried the shotgun approach as well. I also cleared the java cache with no change in behavior.
Edit: In case this helps anyone else in this situation. I went back to the play button above on the site and then is ran a new validation and launched the game.
You are trying to download SK right?
You really should download and install the game client from here: http://download.threerings.net/spiral/client/spiral-install.exe
Also, please read this Wiki page: http://wiki.spiralknights.com/Technical_issues_FAQ
Make sure your computer meets all those minimum requirements, your operating system has the latest updates, and make sure you have the latest version of Java.