Do not buy the app blindly from Google Play. Source a verified third-party reseller or use Family Link. Pay the premium for an OBDLink MX+ interface. Your future self will thank you when you activate your heated seats, program that new fob, and clear that airbag light in under ten minutes.
If you already own AlfaOBD and just want to reactivate or transfer a license, contact the developer directly — they usually help for free. alfaobd activation code better