by tapping "Build Number" seven times in your phone's settings. USB Debugging

: Some features require root access or the "System+" module to be installed within the app.

Granting Secure Settings Pro access to system-level controls introduces a significant security vector.

Secure Settings app by intangibleObject is an older Android plugin—primarily used with Tasker—that is no longer actively maintained or available on the Google Play Store. Because the original "Pro" license key was typically a separate purchase on the Play Store, installing it now requires specific manual steps if you have previously purchased it. How to Install the License Key

Most Pro features (like toggling Airplane Mode or GPS) require the WRITE_SECURE_SETTINGS