You mean the installer doesn't work? Or that the installer won't download?
I'm not sure... I'd say both
It can't be both, because if it won't download you can't try installing it right?
Download: clicking a link on the website and getting a file on your computer
Install: running the file you downloaded from the website and setting up the game.
In as much detail as you can, try and tell us what is happening. I'm still not understanding what we can do to help.