REDUNDANCY ERROR IN DOWNLOADED FILE

Hello,
I have a question and request the reason for this particular error faced by me and my sisters.
We have been trying to download a game (CSS) from a gaming server. As the file is 1.2 GB, it takes something like 1.3 hours to be completely downloaded.
We tried to installed the file after the download complete menu, but on win 7 it says that the application is NOT win32 application. And on the other system is states Redundancy error.
We are not sure what the reason is for this. We had asked the CSS server admin, and were simply informed that the setup file is OK.
We requested our friend to download the same file from the same server, and he informed us that the installation went perfect. As this friend is in another city, it is not possible to ask him to send us this file.
Can somebody inform us the reason of this issue?
Thanks
