A checksum is like a unique fingerprint for a file. If the file has been altered in any way — even by one bit — the checksum will change. Trusted sites provide the official SHA‑256 hash for each APK. You can calculate the hash of the file you downloaded and compare it.
Look for the historical versions tab to find build releases compatible with API Level 22 (Android 5.1). 3. Uptodown A checksum is like a unique fingerprint for a file