Step1: Download and install the latest 3uTools on your PC. Connect your iPhone to PC using the USB cable.
Step2: As shown in the following picture, click Apps, and 3uTools will show you different kinds of applications for you to download. You just need to click Install to download and install your wanted apps.
Step3: In addition, you can directly search your wanted apps in the search bar in the left side. (Taking application Emoji for message as an example. )
Step4: After its downloaded, 3uTools will automatically install it on your iPhone.