1. You will need to update the game to the newest version
2. After that you either need to load a previous save file where you still have a story task (if you didn't save manually, you still should have an auto save file at the start of the chapter. Click "Chapter 2" in the loading menu)
Or you can trigger the event manually: press F7 five times to unlock cheats. Then press F7 again and select "story_chapter_1_25", this should restart the story from the rival dialogue.