Deezer offers an offline mode for its desktop app, which allows you to download your music and listen to it even when you're not connected to the internet. Here's how to activate offline mode in the Deezer desktop app:

1. Open the Deezer app on your desktop.
2. Click on the gear icon in the top-right corner of the screen to open the settings menu.
3. Select "Music" from the menu on the left-hand side of the screen.
4. Under the "Offline mode" section, toggle the switch to enable offline mode.
5. Once you've enabled offline mode, you can start downloading your music by clicking on the "Download" button next to each album or playlist.

Note that you'll need a Deezer Premium subscription to use the offline mode feature. Additionally, the amount of music you can download will depend on the storage capacity of your device.

I followed the steps and did not find offline option for app. Option that should be available even on web app!

How is it possible that there is no option for offline mode even on app?! 

Crazy, to have Premium and not being able to use offline mode which is really important. 

This is not available @Rafael90 !

see link below :

https://support.deezer.com/hc/en-gb/articles/115003884605-Listen-To-Deezer-Offline

in this link is written 

Listen To Deezer Offline

If you're a Deezer Student, Deezer Premium, Deezer Family, Deezer HiFi or Deezer Family HiFi user, you can download your favorite content to listen to offline, including:

• Albums
• Audiobooks (select countries)
• Favorite tracks
• Playlists
• Podcast episodes

Note: You can't download tracks unless you add them to your favorites or to a playlist. You can't download tracks on the Deezer website

How to download your content over WiFi

iOSAndroidDesktop

Note: You can't download tracks on the Deezer website

1. Go to Favorites 
2. Select the tab with the type of content you want to download. For example, Favorite Tracks, Playlists, Albums, or Podcasts
3. Select the download icon  to make your content available for offline listening

Mac OS desktop version doesn't have “gear” button. Where can I find the offline mode on Mac version of the Deezer app?

I’ve checked my MacBook. There is no gearbox. But...somehow the offline mode doesn’t work:

 

I’ve asked Deezer for feedback regarding this.

It is a known issue now as it is has been reported to our devs. There will be an update soon, however I don't have an exact date at the moment.
Thanks for your patience and understanding

My experience on the desktop app has been miserable for almost a year now. I live in an area with bad internet and I can’t listen to my downloaded music without interruption. I’m not renewing my subscription until you fix this.