No, the APP signed by Apple can't be installed. At present, there are four possible reasons: First, Apple's corporate signature may have been cancelled, which is the most common, because the biggest disadvantage of Apple's corporate signature is that it is easy to be cancelled. Once there is a logout, the application will not be installed and will stay on the download page. At this time, we can only log in or register again, and then download and use the APP. Second, Apple's corporate signature has expired. If the company signature you are using has expired and the signer has added a time lock, the application is also unavailable. There will be flashback or renewal tips, and the renewal needs to be completed on the signature platform in time. Third, the installation failure may be due to network reasons, and there will be restrictions when installing the APP. You can turn off Wi-Fi to mobile network or switch Wi-Fi, turn on airplane mode, turn it off and try to reconnect, or install and download using mobile network. 4. If you don't trust the signing certificate used by the APP, you can't open the APP. If you want to download and install on Apple's mobile phone, you need a "trust" process, that is, you can download and install through Apple's signature. We just need to open the settings-general-description file and device management of the mobile phone, select the signing certificate of the APP, find the app to download, and trust this certificate.