To help reduce the potential for malware, Android 14 will begin fully blocking the installation of apps that target outdated versions of Android.

For years now, the guidelines for the Google Play Store have ensured that Android developers keep their apps updated to use the latest features and safety measures of the Android platform. Just this month, the guidelines were updated, requiring newly listed Play Store apps to target Android 12 at a minimum.

Up to this point, these minimum API level requirements have only applied to apps that are intended for the Google Play Store. Should a developer wish to create an app for an older version, they can do so and simply ask their users to sideload the APK file manually. Similarly, if an Android app hasn’t been updated since the guidelines changed, the Play Store will continue serving the app to those who have installed it once before.

According to a newly posted code change, Android 14 is set to make API requirements stricter, entirely blocking the installation of outdated apps. This change would block users from sideloading specific APK files and also block app stores from installing those same apps.

Initially, Android 14 devices will only block apps that target especially old Android versions. Over time though, the plan is to increase the threshold to Android 6.0 (Marshmallow), with Google having a mechanism to “progressively ramp [it] up.” That said, it will likely still be up to each device maker to decide the threshold for outdated apps or whether to enable it at all.

You are observing step 1, intended to kill tens of thousands of older apps, because Google want to clear the field and prepare to next step.

We'll soon see that APK installation will become almost impossible.