they have got a binary package in their official website.
download it from trhe below link taken from the official site
To get the full installation instruction get this from the official site
As i have installed it , i can say that you will need the package (which is in the mandatory list) vte-0.11.11
install that package then run the binary packege
before running the binary package give it the permission with
chmod +x xfce4-4.4.2-installer.run
then run the package with
and follow the graphical installed.