Genius (KYE Systems Corp.) maintains an official support portal. Here’s the direct path:
Driver download guidance (concise):
If you are using an older OS, the official site may have removed legacy drivers. In that case, use the to access Genius’s FTP server from 2015-2017. Only do this if you are an advanced user. genius k641 keyboard driver download exclusive
If you truly need a (e.g., “The Dangers of Downloading Exclusive Drivers from Unverified Sources”), let me know and I’ll write a full 500+ word essay for you. Genius (KYE Systems Corp