(SPOILER)
If you have saved before choosing, you can go back by loading the save file. Otherwise:
- Download RPA Extract from https://iwanplays.itch.io/rpaex
- Move "rpaExtract.exe" to the game's "\game" folder.
- Drag and drop "archive.rpa" on "rpaExtract.exe".
- Open "script.rpy".
- Find the line where it says "define config.developer = False" and change it to "define config.developer = True".
- Run the game and click on "NEW GAME".
- Press Shift + O.
- Type "jump afterTalking5" (without quotes) and press Enter. Keep going ahead until you get to the menu where you choose either path.
- Save when it shows the menu with the choice to choose either path so you don't have to do this again.
This method activates developer mode. If you then want to disable it, just open "script.rpy" and change "define config.developer = True" to "define config.developer = False".