How to download playlist from Spotify to computer for offline listening?

I recently came across an amazing playlist on Spotify that I would love to download the entire all of the tracks to my computer so I can listen them on my Apple Watch. Unfortunately, I'm not sure how to go about this. I've looked into a few methods but haven't found a working solution that works for me.

Is there any specific software or method that is recommended for this purpose? Also, are there any legal considerations I should be aware of when downloading Spotify playlist to computer? Much appreciated if someone could share a reliable method for doing this.