1. Check whether the third-party application program is in the APK format. Android mobile phones only support third-party applications in the APK format.
2. If the application program is not downloaded from "Play Store," it is recommended that the official version be downloaded and installed in the application market.
3. The free storage space is insufficient. Clear the cache of your mobile phone and system trash, or uninstall unused applications.
4. If the application program is installed on the microSD card, please check whether the microSD card is not identified or damaged by the mobile phone. Re-insert the microSD card and restart the mobile phone or replace the microSD card.
5. During the download process, the installation package may be damaged or incomplete due to unstable network connections. Delete the installation package and try again.
6. If this application program is already installed on your mobile phone, uninstall it and try again.
7. The downloaded third-party application may not be compatible with the mobile phone, so the installation cannot be successful. Download other similar applications.