The safest way is to purchase the official release. While SNK hasn’t released a standalone “Perfect Edition,” you can get the original The King of Fighters '97 Global Match (or similar versions) on the Google Play Store. : Online play, improved netcode, HD graphics toggle, and no malware risk.
Even with the Perfect Edition, you might encounter problems. Here are fixes.
King of Fighters 97, officially known as "The King of Fighters '97" or "KOF '97," stands out in the series for several reasons: