The paid app and subscriptions are 2 different versions designed for different user groups. If you purchased the CamScanner license via Google Play, the app will be listed as "purchased" on Google Play and you can install it again freely. You can also send us Google Play order receipt and report to us from the CS app--Me--Feedback. Thanks
Please open the CS app on your phone--click the "camera" icon--click top right three dots icon--tap the bell icon (or swipe up to find "Sound") to turn on/off the sound.
However, in some android versions and device models, cutting off the sound is not supported for 3rd party applications.
Sorry that we have to monetize via advertising now to support our R&D. You can click the "x" or "skip" on the ads to close it in the app, or upgrade to premium to remove all ads. We will also improve our app.
If you can't close it or view the ads frequently, pls send us the screenshots and report from CS app->Me->Feedback for analysis. Thanks