If you specifically need version for compatibility with an older device, you can find it on reputable APK archives:
(specifically the 6.14.18 version) is an open-source, third-party client designed to reclaim your living room entertainment by offering a cleaner, more powerful interface for Android-based TVs and TV boxes. Key Features of Smart YouTube TV 6.14.18 Smart Youtube 6.14.18 Apk
