Yes, I had the same problem. Take a look into the menu "Devices -> Device Tools -> Software Images". There you have all the Images, which are in the NCM Database available.
Make sure that the image you want to deploy fits on every Column ("Driver Required", "Model Required", "Hardware Required") to the device. Also select "edit" and take a look at the required "System memory". You can only deploy an image to a device if everything fits, otherwise it won't show up.
Sometimes you can download images from cisco Website, which are marked as "preferred image", but the NCM doesn't put them correctly into the database.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...