Install BootCamp drivers Windows 10

NEW SOLUTION

Open Boot Camp Assistant, and click on "Action" in the menu bar.

Click on Download Windows Support Software.

OLD SOLUTION

You can download the drivers from Boot Camp Assistant.

First, uncheck "Create a Windows 7 or later install disk" and "Install Windows 7 or later version", leaving only "Download the latest Windows support software from Apple" option checked. It should look something like this:

Make sure you have a USB drive connected, and click continue. You should see a screen like this:

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Select your drive and click on continue. It should download it to the connected USB drive.

Reboot into Windows, and install the support software from the USB.

Edit: I found Brigadier, a software that fetches and installs the drivers for you on Windows. I'll take a look at it, when I have more time.

As of today Windows 10 1809 (October) will not work with bootcamp! - windows will not find drivers - windows will complain about selected drive - etc etc

Use Windows 10 1803 (April) and bootcamp should work like it's supposed to.

Actually they do work... in powershell run the installer for the force switch. Apple puts a check in the installer for each model. The 1809 compatible installer must be downloaded from a Mac that was built after 1809 was released. Example Mac Mini 8,1. Create the boot camp installer from that hardware and you can run that installer on previous versions of Apple hardware in the CLI with the force install msi command..