WinWorldPC is an abandonware museum. They host a library of old applications and drivers. Navigate to their “Drivers” section, filter by “Microsoft,” and locate the BallPoint entry. They provide a bootable floppy image (IMG file) that you can write to a real floppy disk.
The short answer is digital decay. Microsoft officially dropped support for serial input devices after Windows XP Service Pack 2. The drivers were never ported to 64-bit architectures, and they do not natively exist for Windows 10 or 11. Consequently, Microsoft removed the download pages from their website around 2008. microsoft serial ballpoint driver download
Happy retro computing.
Keep the BallPoint for a retro gaming PC (DOS, Win95, Win98). For modern use, frame it as a museum piece. WinWorldPC is an abandonware museum