1, network speed or server problem: shut down and restart, download and install again.

2. You can't install by downloading third-party software: If you can't install by downloading third-party assistant software, it is recommended to use the AppStore of your mobile phone or the itunes store of your computer to download and install again.

3. There is something wrong with the installation package: for example, it is incomplete or the signature is inconsistent. At this time, you can try to download again and then install.

4. The storage space of the mobile phone is full: empty the memory of the mobile phone, delete the software that is not commonly used and try to install again.