Go to Settings > Security (or Apps) and toggle on "Install unknown apps."
"Yanni" is a popular musician. If you are looking for an app specifically to listen to his music: Use Spotify , YouTube Music , or Apple Music . Download CAJITA ANDROID YANNI apk
Downloading APKs from unofficial sources carries significant risks: Go to Settings > Security (or Apps) and
Could you tell me or what you want the app to do (e.g., watch movies, listen to music)? I can help you find a safer, official alternative. Download CAJITA ANDROID YANNI apk