Odd bug with the installer

Ok, so I got a friend to download this, and this is the odd error he got when he opened the installer.

"The version of this fle is not compatible with the version of Windows you'
re running. Check you computer's system information to see whether you need an x86 or x64 verion of the program, adn then contact the software publisher"

I usually know what Im doing when it comes to computers, but this time Im stumped.

C'mon guys, does no one know what to do?

Could you be more specific, what windows does he use?
IMO Installer needs some requirements like .NET Framework i think, check that too.

He has 7, Im not sure if his .net is up to date or not, I'll have him check next time on Skype.

This error is not caused by not having .NET Framework, IIRC. Did he try to download the installer once more?