I picked up Maschine Studio at a pawn shop. How to I get it running? Full version not demo mode.
I'm guessing you can't contact the original owner, so your best bet is contact support and ask them if they can provide you with a licence. You can do that here - https://support.native-instruments.com/support/home
You'll have to deal with the 'Riff' chatbot first but be persistent and eventually you should be able to submit a ticket. If they can't help you directly you can buy the Maschine 3 software here - https://www.native-instruments.com/products/maschine-3