First thing you need to do is uninstall any old version of ADK installed on your SCCM server. I have ADK for Windows 8.1 installed. I will uninstall this and reboot my server.
Click here to download ADK for Windows 10 version 1511.
Important - their is an know issue with the PXE boot images in the ADK for Windows 10, version 1511. Click here to see the Microsoft Blog post about it.
Once you have the ADK for Windows 10 downloaded you can start the installation. You will see the screen below asking what location you would like the installation file to be install on. I selected the default and click the "Next" button.