@Balatan, please remove in OP and next posts, sentence "Download music for offline listening." from original description, become here is many blind and lazy people, who not see text in red and again and again ask same question about downloading songs... Thanks.

I like so much this mod but it doesn't work with chromecast

Correct. The chromecast runs it's own version of spotify - which of course is not the hacked one provided by Balatan.

Now, with the last release (SPOTIFY MUSIC V7.4.0.1799 BUILD 16258327 FINAL [MOD]), works fine with the normal Chromecast but not yet with the Chromecast Music