I'm getting an error code when I want to download your Android app from Google-Play. Please help!
Problems such as "-25 error" normally refer to your Google-Play and Google-Play services. Please go to Setting of your device -> Applications -> Application manager -> Find Google Play and tap on Clear cash/data button. Repeat the same steps for Google-Play services.
If the problem remains you should reset your google account on your phone. Please remove your account from your device and then add it again.
If again the problem remains, you may need to reset your device to factory setting. Do not forget to provide a back-up for all your essentials files before reseting to factory setting.
In addition to all the suggestions above, you have another easy solution: Just download the apk file through Betternet APK link and continue the installation process.