Your phone may indirectly ask if you'd like to change that for a given app, prompting you to enter settings and toggle the Allow from this source setting, at which point you can back out to the installation screen and proceed. In Android 8.0 Oreo and later, this is treated as a per-app permission.
That's usually in Settings > Security, or you can search in the Settings app for "Install apps" or "Install unknown apps." On older versions of Android (on pre-Android 8.0 Oreo, consider upgrading for your security if your phone is this old), you'll manually enable a separate toggle to install apps from unknown sources.
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