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This is the key to unlock CAUSTIC to full version mode. The full version enables song saving as well as exporting to WAV, Ogg and MIDI.
MAKE SURE YOU'VE TRIED CAUSTIC ON YOUR DEVICE BEFORE PURCHASING THIS.
Once installed, simply close the installer and return to CAUSTIC, it will be unlocked.
(If you had already unlocked CAUSTIC v1.x, contact the developer with your order number)