In this savegame, Johan Elting is standing outside Mateus Santos' new home in Port Royale, ready to report that he was on time and Ambroz Bicenos is late. You talk to Santos, get paid, and tell him that you don't want to continue. The questbook does not update and you can talk to Santos again, get paid, and tell him that you don't want to continue. Repeat until bored.
In the regular "Hard Labours of an Assassin", if you tell Santos that you don't want to continue, that ends the quest. But this version is tied to the main "Assassin" storyline in which your mission is to kill Santos, and ending the quest prematurely would probably break the main story, so if you refuse to continue, you can talk to Santos again and go on to the next mission. If you refuse again, you can talk to him again, and again, and if you do it at the point when you've just completed a mission rather than the point where he's just offered the next mission, you keep getting paid.
Suggestion: either modify "Mateus Santos_dialog.c" to remove the "link.l2" lines so you can't refuse to continue; or modify "quests_reaction.c" so that if you refuse to continue, you fail the main storyline mission and get the same result as if you'd missed the deadline for one of the "Apprentice" missions. Editing "Mateus Santos_dialog.c" is probably easier...
In the regular "Hard Labours of an Assassin", if you tell Santos that you don't want to continue, that ends the quest. But this version is tied to the main "Assassin" storyline in which your mission is to kill Santos, and ending the quest prematurely would probably break the main story, so if you refuse to continue, you can talk to Santos again and go on to the next mission. If you refuse again, you can talk to him again, and again, and if you do it at the point when you've just completed a mission rather than the point where he's just offered the next mission, you keep getting paid.
Suggestion: either modify "Mateus Santos_dialog.c" to remove the "link.l2" lines so you can't refuse to continue; or modify "quests_reaction.c" so that if you refuse to continue, you fail the main storyline mission and get the same result as if you'd missed the deadline for one of the "Apprentice" missions. Editing "Mateus Santos_dialog.c" is probably easier...