Most M4V files are downloaded directly through iTunes or the Apple TV app. To download purchased content, ensure your computer is authorized with your Apple ID.
M4V is a video container format developed by Apple that is very similar to MP4 but often includes DRM copy protection . Because of these restrictions, downloading and playing "final" M4V files can sometimes be tricky outside of the Apple ecosystem. Download final m4v
If your device doesn't support M4V, you can convert it to the more universal format: What Are M4V Files? | M4V Format Explained - Adobe Most M4V files are downloaded directly through iTunes