How Do I Allow Installation from Unknown Sources in Android?

Before you install the TeleMessage Archiver apps, ensure that your phone settings allow installations from unknown sources.

Some devices will have a single setting control for all installing applications. Some devices will have a dedicated setting for each application used to install the app.
The installing applications can be your web browser or your file manager application. For dedicated settings, you should enable it according to your installation method.
For example, if you are using Chrome, search if the Chrome security setting allows it. If you are using another browser or app do the same for it.

Open device Settings and tap
Apps.

   →

Tap Manage apps.

   →

Search for your choice of browser or app.

    →

Scroll down and tap Install apps from unknown source.

    →

Toggle ON Allow from this source.

If you didn’t toggle ON Install apps from unknown sources prior to launching the installation process, a warning message will display. Tap SETTINGS and enable the setting as shown above.

If, during the installation/upgrading process a warning popup appears, tap OK

If, during the installation/upgrading process a Blocked by Play Protect popup appears, tap INSTALL ANYWAY