Go to the official AP Tuner website (avoid impersonator domains). Look for "AP Tuner 308 – Professional License."

Platforms like FastSpring, Gumroad (for indie developers), or Plugin Boutique often sell verified codes for audio utilities. Ensure the listing specifically mentions "AP Tuner 308."

It depends on the license terms. Some verified codes allow 2-3 activations (e.g., for a studio desktop and a laptop). Others are single-device. Check the EULA (End User License Agreement).