Surface Dock Firmware Updater won't install - Failed to install SurfaceBaseFwUpdateDriver.dll

I have had issues updating dock  and spent part of the day on it until calling Microsoft tonight and talked to business support. I have two Surface docks hooked up to 2 Apple Cinema displays with MS keyboard and mice setup with a Book 2. Just a week ago I lost the microphone on the Cinema display but the dock and playback worked fine. I downloaded the newest dock updater it got stuck at 33% and then just said connect the dock period.  I went through a bunch of ideas with the brightness controller download (Nope) and the powering off soft reset firmware update on the Surface Book 2 (nope, nope nope) and then I talked to the tech and he told me to try the dock updater but this time with the book screen detached from the keyboard and to attach the dock to the bottom of the screen aloneand after several tries it went through and updated and also the Cinema display microphone came back in  Windows and now the microphone / programs work. Miracle! Other option was to take the dock to the Microsoft store and have them update it. So try that and see if it helps.

I was also running into this problem on my Surface Book (1st gen). The solution is to run the installer as system, for example from a command prompt (you can follow this guide).

Now what is unclear to me is how my Surface Book Base would get the firmware update needed to enable the new/enhanced functions of the Surface Dock.

Yep. Same problem.

Are you also getting the same error when you try to download Surface_Dock_Updater_v2.12.136.0.msi?

I am also having this problem. I have already checked that I am current with Windows Updates, and I have tried downloading the file 3 times.