As of November 2015, to download the Bible in MP3 audio format, go to FaithComesByHearing.com. Create a free account or log in with Facebook to download the Bible in 921 languages and 20 different versions.
On the FaithComesByHearing.com home page, click Free Bible Download. Choose between 921 different languages in the first drop-down menu and the desired Bible version in the second drop-down menu, then log in to begin your download.
If you do not have an account, click Sign Up for Free to create one. Type in your email address and password to log in. If you have forgotten your password, click Forgot Your Password to recover it.
Alternatively, click Log In With Facebook to use your Facebook credentials to access the download. Click Okay in the pop-up window, then click Begin Download. Fill in your name and address, then click Finish & Download. FaithComesByHearing.com allows users to access up to three versions of the Bible in MP3 audio format for free.
Another option is KJVMP3.org. The site offers two free versions of the Bible in MP3 form, one with soft background music and one without. The site allows users to download books of the Bible individually or as six zip files that contain the entire Bible.