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Click "install", and choose to open the file using Gnome Software.
Click "install" in Gnome Software.
Click "launch" to run Spotify once installed.
Using the command line:
sudo flatpak install flathub com.spotify.Client
Run Spotify:
Click on the Spotify icon in the applications list,
or use the following command in the terminal:
flatpak run com.spotify.Client
References
https://github.com/rpmfusion/lpf-spotify-client
https://flathub.org/apps/details/com.spotify.Client