https://devzone.nordicsemi.com/f/nordic-q-a/23431/nrf5x-mdk-keil4Dear all, I want to develop applicattions for the board nRF52840 Preview DK. I went to the download section of this board , and i saw the following software nRF5x-MDK-Keil4 and nRF5x-MDK-Keil4-5-Clause-NOD, which is the purpose of this software? Withen-USTelligent Community 13Wed, 12 Jul 2017 09:12:00 GMThttps://devzone.nordicsemi.com/thread/92073?ContentTypeID=1Wed, 12 Jul 2017 09:12:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f2774a7c-ea43-413a-9ecd-04f10c23c1f3Sigurd<p>Hi,</p> <p>As explained in this answer <a href="https://devzone.nordicsemi.com/question/96796/what-do-the-mdk-installers-change/?answer=96843#post-id-96843">here</a>, the MDK installers add support for Nordic chips. This includes device header files, flash algorithms and system description files.</p> <ul> <li>For Keil 5, you normally don’t need to run any installer, and Keil should prompt you to install the nRF_DeviceFamilyPack when you open a project. If you for some reason don’t get this prompt, you can download and install it manually with the <code>nRF5x-MDK-Pack</code> / <code>nRF5x-MDK-Pack-5-Clause-NOD</code>.</li> <li>For Keil 4, you should download and install <code>nRF5x-MDK-Keil4</code> / <code>nRF5x-MDK-Keil4-5-Clause-NOD</code>.</li> </ul> <p>From MDK version 8.12.0 the option to install the MDK with a new 5-clause Nordic proprietary license was added. See <a href="https://devzone.nordicsemi.com/blogs/1122/introducing-nordics-new-software-licensing-schemes/">this blog</a> post for more information about that.</p><div style="clear:both;"></div>