If your device doesn't support M4V, you can convert it to the more universal format: What Are M4V Files? | M4V Format Explained - Adobe
Use QuickTime Player or iTunes, which are the native applications for this format. Download final m4v
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. If your device doesn't support M4V, you can
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. If your device doesn't support M4V