If you are "preparing" the story by modifying stats or choices, you can use online tools like the Save Editor Online .
To ensure a save file from an older version (like "Book 1") works in a newer one ("Book 2"): Locate the 1-1-LT1.save in the old game's save folder. Copy it to the new game's save folder. 1-1-LT1.save
Ensure it is named correctly; if you download a file and it has a suffix like 1-1-LT1 (1).save , it until you rename it to the exact original format. If you are "preparing" the story by modifying