https://devzone.nordicsemi.com/f/nordic-q-a/36667/trouble-running-an-older-project-sdk5-2-and-sd6-2-1-on-uvision-5-25Hello, we are trying to get a new laptop compiling and debugging with an older project. The old project uses SDK5.2 and SoftDevice 6.2.1. When we open it we get the error &quot;The Project references devices, files, or libraries that are not installeden-USTelligent Community 13Tue, 24 Jul 2018 14:15:12 GMThttps://devzone.nordicsemi.com/thread/141181?ContentTypeID=1Tue, 24 Jul 2018 14:15:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:210afe9a-f242-4abe-a36d-67781bbd610aHung Bui<p>Hi Chris,&nbsp;</p> <p>&nbsp;</p> <p>Have you installed the<a href="http://www2.keil.com/mdk5/legacy"> legacy pack?</a></p> <p>You may need to use Keil v4&nbsp; / gcc to build with SDK5.2</p><div style="clear:both;"></div>