GBWhatsapp is an Android application, and that is why you will need an Android emulator on your Windows phone to download the app on your Windows phone. The best Android emulator, in this case, is the MEmu player. Download it on your Windows phone. Download GBWhatsapp APK on your PC. Click on the APK icon on the emulator and select the GBWhatsapp APK you downloaded, and GBwhatsapp will be downloaded on your Windows phone.