The drivers becomes "unsigned" after a major Windows update

[support]

Please note that our drivers are digitally signed for a period of 2 years only* (the digital signature is valid for 2 years max, then we have to pay again for 2 more years).

If until now, our interface was running well on your Windows computer, and now you see the message "driver is not signed", there is a good chance that the OS made a major update and forgot the existing installed driver. So when you plug the interface, the OS tries re-install the driver with the existing installed system files.

And, if the digital signature of the existing system files is outdated, then you see the message "driver is not signed".
In that case, you have to re-install the recent drivers.
Please follow this to re-install the drivers: viewtopic.php?f=15&t=4256

Please be sure that if we could pay for an unlimited digital signature, we will do it.

* The official reason is security ; the unofficial reason is money.