Hi,
For us to assist you, can you confirm the following information:
- Is this the first you have encountered this issue?
- Have you tried to first check for and install the update using Windows update while Surface Dock is connected to your Surface Book?
- Have you also tried re-downloading the Surface Dock Updater, then install it to your device?
For now, you can also force a shut down and restart your device, then try it again.
Regards.