Cant install apk even with enabled "Unknown sources"?
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"Disable your screen dimming app. :)

Some screen dimming apps work by overlaying the whole screen with a translucent window, and letting touch events pass through to the activity below, but for security reasons, you can't interact with system dialogs (such as the package installer) through another activity.

It sounds counter-intuitive, but it could be the cause. It's more likely than a corrupt APK file or a version incompatibility, either of which would cause an error message."

from:
https://android.stackexchange.com/questions/82155/why-cant-i-install-this-downloaded-apk

Origonal Creation date in Vivaldi: 28 November 2018 @ 20:34