Due to the internal reasons of ios system, the software cannot be updated, even in the third-party app store. You can try the following methods to solve the problem:

1. Uninstall the old version of the software and download it again in the synchrotron. The resources of the synchrotron are all authorized by the original, with fast resource updating speed and strong system adaptability of the software;

2. Upgrade the software with the synchronization assistant on the computer side, enter the application module of the synchronization assistant, select the software to be updated, and select Update on the far right side of the selection bar.