We strongly recommend owning a legal copy of KOF '97 (e.g., on Steam or Switch) to morally satisfy copyright concerns. The APK is best seen as a fan upgrade for existing owners.
If you can tell me (e.g., Samsung Galaxy S23, Google Pixel, etc.) or what your experience level is with fighting games , I can give you more tips on setting up your controls! We strongly recommend owning a legal copy of KOF '97 (e