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I repeated the manual procedure as described on webpage (no errors apparently), test utility finds tuner and even communicates (reads data... no display, however, there is only message "reading samples in async mode... lost at least 124 bytes.),

In the CMD window, when I run standalone app, at the end it says:
Attribute error function 'CancelloEx' not found rtlsdr_scan returned -1
And that's it.

The older standalone 32-bit version (from 01/25/16) works OK.