He could finally download 2160p (4K) source files instead of grainy 720p [3, 4]. Batch Downloading:
The original Android TubeMate is freeware supported by ads; it does not typically require a "license key" for its core features. windows tubemate license key extra quality
Only download from official mirrors listed on tubemate.net. He could finally download 2160p (4K) source files