Go to Settings > Security & Privacy > Install Unknown Apps .
Select the specific app (like Chrome or your File Manager) you will use to open the file and toggle on Allow from this source . Download ZAL PLUS apk
For better security, return to your settings and disable the "Install Unknown Apps" permission once the installation is finished. Zal - Apps on Google Play Go to Settings > Security & Privacy > Install Unknown Apps
If you choose to proceed with a manual installation, you must first allow your device to install from unknown sources: Download ZAL PLUS apk