hello Rick,
When you install new pack, then previous pack gets deleted. You can avoid that by creating a custom pack (in YEM) which contains Entertainer AND Country pack. That is, you check both packs at creating install pack.
There's also a method to "add" new content to existing pack, by creating so called "quick" install pack (read manual for that). When quick install pack is used, then only additional content is actually installed, which makes the whole process faster. But keep in mind that you still need to also check the content that's already installed in keyboard -otherwise it will be deleted.
Bogdan