Please check the settings in the web application, as per the screenshot attached. If the option SR25 Hardware is not selected, the "I have a registration code" will not be shown.
If this does not solve your problem, can you please provide more details:
- Do you have a registration code?
- If you swipe an unregistered card, will the printer print out a registration code?
- Do you only see this issue on Windows 10?
- What is your Windows 10 version? Open up a command prompt and type winver, it should give you the version.
I will mark this as answered as it was solved in a support case you opened with us back in February.