Go to Settings > Security and toggle on Unknown Sources to allow installations from outside the Play Store.
Generally, versions up to v39.6.26 have been confirmed to support Android 5.0+. Google Play Store Apk Download For Android 5.1
Because Android 5.1 is an older operating system, the latest 2026 versions of the Play Store (like version 51.x) typically require Android 6.0 or 7.0+. For a device running Android 5.1, you should look for specific legacy variants: Go to Settings > Security and toggle on
Since you are installing a file from outside the official store, you must manually enable permissions. Google Play Store Apk Download For Android 5.1
Google Play Store 22.5.13 is one of the most reliable versions that still supports the minAPI 21 (Android 5.0+) requirement.