PDF with print module and wkhtmltopdf - how to install?
I have downloaded the latest version for Windows.
  As described in the instructions I put the executable in the directory sites / all / libraries.
  After I renamed the cryptic file names wkhtmltox-0.12.1.2_msvc2013-win32.exe in wkhtmltopdf, it was recognized in the print module settings.
  


The executable you've downloaded is the installer, not the wkhtmltopdf executable. You need to install it to the sites/all/libraries.