Remember... To download the app is free. This is how you do it and please read this carefully to help you. Golden rule: If you don't trust it, don't install it! Use this guide with confidence, if you feel that it's not for you, do not continue
Unknown Sources This message will appear to say that you are installing an app onto the device outside the Google Play platform. This is ok to proceed if you wish, however saying no at this stage will stop the installation. You can allow this by enable the unknown sources.
How? The message might be close to the words of "For your security, your phone is not allowed to install unknown apps from this source" If you click on "Settings", you will be able to select "Allow from this source". This is your choice to download and enable this option to proceed any further. If in doubt, do not proceed any further from this point.
During Installaion... When installing this app, you might come across this message: "Blocked by Play Protect" It will then show the icon and this message "Play Protect doesn't recognise this app's developer. Apps from unknown developers can sometimes be unsafe"
What should I do? This is not saying that its unsafe, only that its a caution before you continue. If you do not trust the app at this stage, click on ok and there will be no hard feelings. If you wish to install and trust it, click on "Install Anyway"