If Method 1 fails due to a "verification" error, the IPA likely needs to be signed with a valid Apple ID (free developer certificate). Here is the trick: 3uTools can inject an IPA into an iTunes backup and then restore that backup to your device.
We will cover three different methods because the best method depends on your device’s status (jailbroken vs. non-jailbroken) and the type of IPA file you have. how to install ipa file with 3utools
Start by launching 3uTools on your computer. Use your USB cable to connect your iPhone or iPad. If Method 1 fails due to a "verification"
Click on the left column (not the top tab) and use the Import or Install IPA button to select your file. how to install ipa file with 3utools