I bet some of you have already tried to download that app, which unforntunately couldn't be found on the Google Play Store. This is common for us living in Africa (don't really know why but guess for many different reasons). This is even more flagrant when you compare the Play Store version here in Africa with that in the Western countries. However here is a small guide to help get your hands on that convoited app.
Many developpers are restricting their apps to some countries for their various reasons. This can be troublesome for us especially when that app was a "must have" or one that'll help you in your daily activities (I experienced that with the Weebly app ^^). Some of you may have experienced that with the Pokemon Go app that isn't available in many Sub-Saharan African countries. However wipe your tears this are 2 solutions I have for you.
Establishing a Virtual Private Network
If the app is not available in your country, then you'll have to go to another country where it is available. However here, you'll virtually travel to another country using a VPN. A VPN allows us to protect our communication over the internet thereby keeping a certain anonymity. With a VPN, we can also go as far as appearing to be connected from another country and therefore you can enjoy all these great contents on the web without restriction.
You have a large cathalague of VPN available to you. Personally for my smartphone, I use Opera VPN that allows me to connect from 5 different countries of my choice (it has other useful features that won't be discussed here). For desktop, I personally use the VPN already proposed by Windows 10. When your VPN is operational, simply head over to the app's informations, empty the app's cache and close the app completely (you can force stop the app in that inteface). You can then open your Play Store app again and the magic is there.
By Downloading the APK File
I think this is the most popular method as it is more direct ad does not require the downloading of a third party app. In this method, you simply head over to website that host the APK files of various apps. They usually have a large cathalogue of app, you choose the app you want, download the APK file and when the download is finished simply click on the APK file, install it and the app is there. Now beware of what you downlaod and where you download. These APK files may purposely contain viruses theryby comprimising your security. I personally use APKmirror and uptodown to download APK files. Note that they won't contain the whole cathalogue of the Google Play Store and so you may not found what you want there and so using a VPN may be a better choice.