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How do I set my phone, to allow apps from unknown sources please?
Settings > lock screen & security > unknown sources
keep in mind that this will put your data at risk
Hi @Karen-0-, welcome to our forum!
In Android 8 and Android 9 this has been reworked a bit and now each application has their own restriction for this.
If you go to Settings > Apps & notifications > (Advanced) > Special app access > Install unknown apps > tap the application you are going to use to install the apk-file > Allow.
Keep in mind that there is a risk involved when installing applications that are not downloaded/installed from the Google Play store.
I hope that helps and have a great weekend!