Oh, I missed that you said Windows Phone 7. Remember the headline was "WarLight for iPhone and Android" - this is a native iPhone and native Android app meaning it won't work on Windows Phone.
According to UserVoice, there's almost zero demand for Windows Phone support (it only has 2 votes compared to hundreds for iPhone and Android). If you want it, you should [vote for it](
http://warlight.uservoice.com/forums/77051-warlight-features/suggestions/1067509-windows-phone-7-client?ref=title)!