You can either do 1 of 2 things to update RiX. One is to look on the intro page if RiX, (or the page that you see when you open RiX), and 2 is to go to the offical RiX website here:
http://www.rix.tk/
The site is under consrtuction so it's not up yet. But soon the site will be done. Go there for the latest information about RiX.
If you would like to help in the RiX project, you must know C# and you must have Microsoft Visual C# 2008.
RiX will not check for updates on any other version you have.
Enjoy, - Hblade
There are currently 2 people working on RiX. thats me, and DarkParadox(The website designer)