It is important to check which "Green TV" you actually need, as there are other unrelated apps:
A lightweight tool for playing your own video files or stream links (MP4, HLS, etc.) available on the Google Play Store . Descargar GreenTV apk
Live TV, "Watch-From-Beginning," and custom channel lists. Other Apps with Similar Names It is important to check which "Green TV"
Searching for "GreenTV apk" can be a bit confusing because there are several apps with similar names. Descargar GreenTV apk
Use a mobile antivirus tool to ensure the file is safe before opening it.
Go to your device's Settings > Security (or Apps) and toggle on "Install from unknown sources."