For New Android Versions (Oreo, Pie, Android 10, 11 and 12)

1
Go to your Android Settings > Apps & Notifications.
2
Select Advanced or the three dots at the top-right corner  users might see either option depending on their device.
3
Select Special App Access.
4
Choose Install Unknown Apps.
On Android device, navigate to 'Apps' > 'Settings' > 'Security', enable 'Unknown Sources', then tap 'OK' to agree to enable this setting. This will allow the installation of third party apps and standalone APKs.