Install this ringtone (PC, Mac)

1) Open iTunes and find the folder "Ringtones" on the right column (if it isn't there go to Preferences/general and check the "Ringtones" box under "Show").

2) Drag & drop the "suoneria_paine.m4r" file on the "Ringtones" folder (or alternatively on the "Library"). 

3) Connect the iPhone. You should see the ringtone in the "Ringtones" tab of your iTunes iPhone page. Select it and sync.

4) in The iPhone, go to Settings/Sounds/Ringtone. You'll find "suoneria_paine.m4r" in the custom tones at the top of your list.