To get the Spotify MOD APK with a music download option, you need to follow these steps
Enable Unknown Sources: Before you can install the MOD APK, you need to allow your device to install apps from unknown sources. Go to your device's settings, then Security, and enable "Unknown sources."
Install the APK: Locate the downloaded APK file on your device and tap on it to start the installation process. Follow the on-screen instructions to complete the installation.
Use the App: After installation, open the Spotify MOD APK and use the music download feature as per the modifications made by the developer.