Yeah i have 7 zip. I'm just having problems unpacking the file.
Ok, so long as you have 7-zip, and you have the right file downloaed, "UFG2-alpha-023A.rar", then you should have all you need.
7-zip is available with an installer, or portable. If you installed it, you should be able to right clock the file, and have a 7-zip submenu, with actions such as "open archive" or "extract".
In either case selecting "open with" should allow you to open it with 7-zip. By leaving the box checked "always open with this program" it will open all .rar files with 7-zip.
Make sure you select 7zFM.exe as opposed to 7z.exe.
Other ways to open it in 7-zip would be to open 7-zip and browse to the file, or drag the file onto 7zFM and it should open inside it.