First of all, I should confirm again that this patch is for the PC version only. If you're using any of the console versions, you can't use this patch.
If you are using the PC version, follow the download link for the full package and click the Download button on that page. You'll download a .zip file, which you can open using Winzip (available
here). The .zip file contains an installation file (install.exe) which you'll need to run. This installation file should detect all the right folders as necessary and place the files automatically. Additional instructions and troubleshooting information can be found in update.txt, included in the .zip file.
Once the installation is finished, you'll be able to load the new rosters from the Load/Save menu in the game. Please note that you cannot apply the patch to a Dynasty/Season/Playoffs already in progress.