You will need to download and install a free program to unwrap it.Winzip or WinRarr will also unwrap it.Or
http://www.7-zip.org/
After you install it . Download the WT library. When thats done move the downloaded file to a Folder you create for it.
Right click on the RAR file . Choose "Extract here"
The file will expand into its separate elementsdouble click on the file "setup.exe". Followprompts . Thats it .