I was unable to find a specific driver for the Toshiba Dynadock PA3575E-1PRP for Windows 10.
When you connect the dynadock for the first time to a Windows 10 machine it will automatically install the drivers for most of the functions the dock supports. I did find newer drivers for the DisplayLink here http://www.displaylink.com/downloads/windows and found they functioned better.
For more information on the above-mentioned dock check the User Manual which is for the dynadock PA3575U-1PRP.
Toshiba’s support site where you might find drivers for Windows 10 for your specific dynadock. http://support.toshiba.com/support/family?fname=dynadock