Install the software (it works on Windows; Mac users will need Wine or a virtual machine). Open the application and load your .pdo file via File > Open .
This creates a common dilemma for hobbyists: how do you convert a PDO file to PDF without spending money on the full version of Pepakura Designer? pdo to pdf converter free
Online converters are less reliable for PDO files because they often struggle with the complex unfolding data, but they may work for simple designs. Install the software (it works on Windows; Mac