If you like, after doing this for a week or so, you might choose to do it without guidance at all. This is totally a matter of preference - some people choose to "go solo" after a time, and others alway use the recorded guidance.
NOTE: You are welcome to download the audio version to another device. The recording can be accessed directly at https://palousemindfulness.com/disks/bodyscan20min.mp3. For help in downloading, see How to Download Recordings to Your PC or Mac.