sorry for the delay.
The demo app is activated with a Premium license, but in your case the activation won’t work as the package name is not correct (not the one of the demo app)
f the license is not activated, the library remains in a restricted mode in which the functions of text extraction and research are not enabled.
For the test you can:
1- Use the demo project itself .
2- Give your project "com.radaee.reader" as a package name, this way the premium license will work.