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It's located in maps/scenario/a2c0m1 (I'm not sure, but it seems to be: addon 2, campaign 0, mission 1; and the prologue is mission 0, i.e., a difference of 1 digit). It's quite difficult to turn it into a scenario because the campaign missions are packed. The texts are separate, and the maps are separate. It's difficult for the average user to extract it from there, but it would be easier for everyone to create a mod that can be downloaded and simply placed in the user mods folder. All that needs to be done is to combine everything into one map, only changing the links to the txt files, or simply create it as a separate campaign with a link to the map (which everyone already has). Or, extract it and remake it into an H5M map in the appropriate forum.