For a LG or Android equivalent: modern phones have an inbuilt app to unzip file. If on older phone, click on the icon to get one without any cost:

winzip.png

Once the download of your file is complete, click 'open' with Winzip.

Extract the files. Depending on what music player you have installed you should find the mp3 clips ready to play on the music player.

If not, go back to your 'download' folder, and arrange the order numerically, ensuring that the first file is at the top. Click on the first file it and it should play in the built in music player. 

Depending on your settings, a music player might arrange the files by file size and not necessarily by name or number. Rearrange them so that the numbers go in numerical order and begin playing the audiobook.