Install using curl:
curl http://ranfs.com/pub/rfdd/all/get.sh -o -|sh -s /usr/local/bin

Install using wget:
wget http://ranfs.com/pub/rfdd/all/get.sh -O -|sh -s /usr/local/bin

Install using powershell:
$rfdd_dir="c:\rfdd";Invoke-Expression(New-Object Net.WebClient).DownloadString("http://ranfs.com/pub/rfdd/all/get.ps1")