After Download if you get the following message as shown in the image below then kindly follow the steps given below:
Click on settings as shown in the above image.
Enable the Installation of apps from this source as shown in the image below
Launch the downloaded FreeVPNNow.apk file from the downloads folder and you should now be able to install the app.
In case you are still facing any issues then kindly contact us at email@example.com