cyusb3.sys is a core system driver file for Cypress (now Infineon) FX3 USB 3.0 SuperSpeed controllers . You cannot (and should not) download this single .sys file alone from a "DLL download" website. Those sites often distribute outdated, incorrect, or malware-infected files.
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Instead, you need to download the from the manufacturer. This will install cyusb3.sys along with its supporting files correctly. Where to Safely Download the Driver The driver is part of Cypress/Infineon's "SuiteUSB 3.0" or the "EZ-USB FX3 SDK" . cyusb3.sys driver download
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