There is an option to skip the verification during installation. But first, you need to download the Thunder VPN mod apk file. After that go into settings then security and enable "Unknown Sources". Now install the application & open it then copy the VPN config file( .conf ) which you have downloaded before & paste it into sdcard/Thunder VPN/. Now go to the Thunder VPN app's setting option then tap the "Skip Verification" button. After that, you are good to go for unrestricted access.