Use Apple Configurator 2:

Download and install Apple Configurator 2 from the Mac App Store.

Connect your iOS device to the Mac and open Apple Configurator 2.

Drag and drop the IPA file onto the connected device in Apple Configurator 2.

Follow the prompts to install the IPA file on your device.

Use Xcode (for Developers):

Open the project associated with the IPA in Xcode.

Sign the app with a proper development or distribution certificate.

Build and run the app on your connected device.

Manual Installation with iOS App Signer (advanced method):

If the above methods are not suitable, you can use tools like iOS App Signer along with Xcode to sign and install the IPA.

You'll need to have the right provisioning profiles and certificates to sign the app.