The archive contains 2 folders "arena mod installed" and "arena mod not installed". The first one is necessary if you already have the "save arena victims" mod installed, and the second one is necessary if you have not installed this mod. There are 2 folders in each of these 2 folders, one is the mod itself, and the second is needed in case you want to delete this mod. And so, to install this mod, you need to go to the "mod" folder, to a folder suitable for your case, and copy the "data" folder to the root folder of the game with the file replacement. But there is one "but". In order for the mod to start working, you need to restart the story. Have a nice game!