: Verify you are not mistaking the letter "O" for the number "0", or the letter "I" for the number "1". Ensure you are looking at the credentials on the PS-300B CD-ROM package rather than the physical serial number label attached to the back of your sewing machine hardware. Conflict with Legacy Software Versions
If the sticker has worn off, do not panic. You can sometimes retrieve the Key ID via the machine’s onboard menu if the dongle is still recognized:
Users frequently encounter the error message during installation. This is usually caused by one of three issues:
