Because the master recording rights were tangled in legal battles between Amaru Entertainment, Death Row Records, and various sample clearinghouses, the song never saw an official retail release. That is why you are searching for a download rather than buying it on iTunes or Spotify.
By searching for you are participating in the preservation of hip-hop history. You are keeping alive a version of Pac that told you to put your vest on, face the world, and keep breathing. Download Never Lose Hope By 2pac