If you are trying to install Lollipop system APKs (like the launcher or camera) on a modern phone running Android 13 or 14,

<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="21" />

Use BlueStacks , NoxPlayer , or the official Android Studio Emulator . You can select "API 21" (Android 5.0) as the system image to create a virtual Lollipop device.

If you are looking to download APKs from the Android 5.0 era, Since these files are no longer hosted on the Google Play Store, you have to sideload them. Here are the golden rules:

It’s hard to believe that nearly a decade has passed since Google unveiled Android 5.0 Lollipop. Before Material You, before the dark mode craze, and before gesture navigation, there was Lollipop. It was the update that fundamentally changed the face of Android, introducing the design language that paved the way for the smartphones we use today.