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[Locked] HALO 2 PC KEY HELP

OP ImTheFrostbite

All,

I just dug up my old Halo 2 disc for PC and want to play the game mainly to work in the map editor and just play around in there (not really multiplayer). However, I do not think I have the key anymore... Does anyone know how to play this game again without downloading some sketchy files?

Thanks :)