How can I integrate this into Windows XP?
Is there an installation file or a ready-made file that I can copy to a specific folder?
Unfortunately, I am not familiar with this.
This was just a hint that Elliptic Curve Cryptography can be ported to Windows XP. No more, no less. How this can be done, no idea. The linked project is not documented more detailed. But as you stated clearly, you like such short information. Personally, I do not really need such a port.