Hi,
I faced similar issue last time when I tried to use ydk-cpp. The latest ydk-cpp/cisco-ios-xr uses YANG models from cisco XR 6.3.1. Whereas in the software download section I could only find 6.1.2 (https://upload.cisco.com/cgi-bin/swc/fileexg/main.cgi?CONTYPES=Cisco-IOS-XRv)
Could you please let me know where I can download Cisco-IOS-XR 6.3.1. PacketDesign is a Cisco Partner with NDA in place. We are also interactiving with other BUs and have dev images in our lab.
Thanks,
Hari