How to install CodeIgniter on my website that is registered to HostGator.

Hey everyone in the CodeIgniter community, my name is JPR2473. I recently discovered CodeIgniter and I'm wondering if people could help me out here. I am wondering if its possible to install CodeIgniter onto your website. Unfortunately I don't know how to install CodeIgniter, and I need CodeIgniter specifically for this specific project. I am making a file sharing site for a group project that my friends and I are starting.

Here is a link to the filesharing site tutorial: http://code.tutsplus.com/tutorials/creat...--net-3534

If anybody could help me out, that would be great! Please reply back to me ASAP.

-JPR2473.