Note: The ide number is the unique build fingerprint. 4.0.1 = build #193.6626763.

The IDE lost track of your SDK folder. Go to File -> Project Structure -> SDK Location . Manually set it to the folder selected during installation.

: Android Studio 4.0 is generally based on IntelliJ IDEA 2019.3.3. Ensure you have a compatible JDK (usually bundled with the installer).

Why? This particular build, released in June 2020, represents a sweet spot for compatibility. It fully supports Android 10 (Q) and Android 11 (early builds) while offering a stable environment for projects that rely on older gradle plugins or third-party SDKs that haven’t updated to the latest API levels. If you are maintaining a legacy app, teaching a course with established lab materials, or simply experiencing hardware limitations with newer versions, securing the correct is crucial.