copy install command doesn't detect OS

Hi, 
I am on Windows, copy always got`curl -fsSL https://plannotator.ai/install.sh | bash`, this last very long time
<img width="323" height="137" alt="Image" src="https://github.com/user-attachments/assets/c7ea023d-7480-4499-aeb2-038fdf8c4508" />
