Unable to configure the network name and the password?

these parameters are configured by the system and can't be configured by non-system apps.

Connected to the Wi-Fi Hotspot successfully but NO internet?

Follow the instructions in the help section for every device you want to connect. If you already followed the instructions you may have to test the internet in the browser if the connected device is not Android.

Some apps doesn't detect the internet connection?

This is due to proxy protocol limitation. it is mainly designed for web surfing.

I have purchased the app but it still limited and promote me to purchase again?

Reinstall the app/key from play store with the same account you purchased with.