BECKHOFF CP-Link3 - Manual (Page 72)

Page 72
Open Windows Explorer and navigate to: C:\Windows\System32\drivers. Rename the file TcUsb.sys, e.g. to
TcUsb_old.sys. The subfolder "Drivers" of the CP-Link 3 program directory contains the file TcUsb.sys. Copy this file to
C:\Windows\System32\Drivers.
Note
Restart the operating system
After the update of TcUsb.sys you need to restart the operating system!