As a pre-requisite to MDT, you must install the latest Windows Assessment and Deployment Kit (ADK). Search Microsoft's site for the latest version and download it. Typically, you'll get a small app that lets you select components that are then downloaded and installed in the background. The components that you need are:
- Deployment Tools
- Windows Preinstallation Environment (Windows PE)
- Imaging and Configuration Designer (ICD) [Windows 10 only]
- User State Migration Tools (USMT)
It is highly suggested that you save the downloaded ADKSetup.exe file in a folder at the root of your MDTData disk (such as the \Install.MDT folder).