Stop crying, just be grateful for the free exposure you are getting from this. You really think he's trying to get your software for free and not eventually pay for it? He probably has already purchased it and licensed on another computer at home.
The same way Kayne is grateful for the free exposure he got for his "The Life of Pablo" album and his "Tidal" subscription-based music streaming service, by meeting with his legal team to discuss the possibility of suing The Pirate Bay? [1]
Do you think a kid in his bedroom who hasn't saved up enough allowance to buy Serum, start his own subscription-based music streaming service, and hire his own legal team to sue pirate bay, probably has a mom who has already purchased it and licensed on another computer at home, too?
Avicii and others have been spotted with cracked software, and some claim to have the licence on other computers but not on the one they were filmed with.