The answer is: 1. Check the software download instructions to see if there are requirements for software installation platform and mobile phone system version.

2. Check whether the downloaded software format is correct: the software format supported by Android phones is. APK。

3. Check whether the phone's memory is full, and open the phone settings-storage-available space.

4. Check whether the downloaded software has other versions, and try downloading other versions (probably because the downloaded software is compatible with mobile phone software).

5. Try to change other download methods.

6. If the mobile phone cannot download any software, it is recommended to back up the data in the mobile phone and restore the factory settings of the machine.