You should see a success message.
Download RGSS102E.dll (the standard RPG Maker XP script interpreter). Place it directly into your Ao Oni folder. ao oni 30 fix
The in the error refers to Script Line 30 in the game’s core Main script. When the game launches, it checks for the RTP. If the RTP is missing, corrupted, or blocked by your operating system, the script cannot proceed past line 30, and the game crashes. You should see a success message