I think you do need an account (which could be trials) because you have to use an ARL or your credentials to login to Deemix with.

I personally pay for a Deezer family plan and just use offline play mainly for my car.

From what I remember MP3DownloadNet uses the Deezer API to download MP3s and FLAC. I used to collect music with this site before it all the ads but it seems like it's still working.