You can still play KOF Wing 1.9 via:
Igniz stands as one of the most powerful Nest bosses in the history of fighting games. Choose as your primary fighter. Play through Arcade Mode and defeat the final stage. King Of Fighters Wing 1.9 All Characters Unlock
The "All Characters Unlock" version is typically found on sites like Y8 , CrazyGames , or Flash game archives. , as some repacks include adware. The safest method is to find the original 1.9 .SWF and use a cheat code or memory editor to unlock characters yourself. You can still play KOF Wing 1