The Best and Easiest way to get your music into iTunes:
Once the file is downloaded, it should only take a couple of minutes to get the music into iTunes.
Again, once the file is downloaded, Right click on it, and Unzip/Extract the file. It will Unzip/Extract into its own folder. Open iTunes, create a Playlist, name the Play list the name of the Mix.
Making sure you can see iTunes and the Folder with your music, drag the Folder (Not the individual songs from inside the folder) onto your new playlist. The playlist will now populate with all the music with in the folder, In proper order.