OK, so this has been mentioned a while back - after downloading the program from the website, attempting to open will pop up either a "Cannot open file" error (For the 7zip archive) or a "Setup files are Corrupt" error (For the Installer).
I've attempted downloading a couple times now, and this has happened every time.
Do note, I have been attempting to get the x64 version, and haven't tried the x32 one - will update as to whether that works or not. But still, the x64 downloads do appear to be broken. Probably on your end.