Does anyone know how to make a standalone in UDK? Thread

I know UDK is obsolete. I know it's old tech. But here's the thing, a long time ago I went to summer camp and made a game using UDK (that was all they would let us use), and it wasn't just a map for Unreal Tournament, it was its own little game. For YEARS I've been wanting to share it with someone but I can't get it to work outside of the engine. Does anyone have any ideas? All help is appreciated!