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., the difference is in one 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 ordinary users 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 you have to do is combine everything into one map, just change the links to the txt files, or simply create a separate campaign with a link to the map (everyone already has it). Or, you can extract it and remake it into an H5M map in the appropriate forum.