Problems integrating pro version into Android SDK

Hey,
I got your pro version and wanted to integrate it into my app. For this I downloaded the "RadaeePDF AndroidStudio 3.55.4" as well as the 3.15.3 version of the Pro PDFEx sources. The problem is that when I try to include PDFEx into the SampleApp/ViewLib (proposed here: LINK REMOVED BY SUPPORT BECAUSE THE KB WAS OBSOLETE, THEN REMOVED) with replacing the files, I get several errors. Not only AndroidX related but also errors like: "cannot find symbol method vScrollToPage(int)" (PDFLayoutView line 1332 trying to access this Method in PDFLayout) or "VPage cannot be converted to IVPage". Second ones are the more important ones, since I resolved the AndroidX issues.

What am I doing wrong?
Or which versions of ViewLib and PDFEx do match?

Best regards

dear user:
PDFEx source seems very old version of java codes.
you shall use source codes of last demo project, the last demo project shall include all java codes.
sorry about that knowledge, we will update days after.

I confirm too.
PDFEx sources are not needed.
As you can notice those sources are really old.
After 3.15.3 we opted to distribute full sources so you get them with the SDK of the 3.55.4.

The obsolete KB has been removed.