Long story short I was finally able to buy a notebook for my games. I am all excited to use the sound system and put the notebook on the table.... buuuutt....

There is a way to 'activate' the DLC's bought on Android on my Steam Account ?

Not that I'm aware of. Accounts aren't linked across devices.

Yeah, unfortunately, you cannot transfer the DLC from Android to Steam.

Thanks for the answers. Sad...