1. The installation package may not be downloaded completely. You can confirm it by comparing the size of the downloaded apk package with that of the normal package (generally, the files with errors are only 10 KB). If this is the case, it is recommended to download it again or download it to a different computer when the network is stable, and then reinstall it;

2. It may be that the signature of the installation package is inconsistent with the signature of the currently running WeChat installation package. This may be because the newly downloaded installation package has been modified. At this point, you can try to download it again and then install it, or use the optimizer to uninstall the original program and then install it.