@SGaist It worked!! 😄😄😄😄 Thanks!!!

So for anyone else who stumbled here, the trick was to get this package from the Qt installer :

MSVC 2017 64-bit

And then go in Qt Creator, and use the aforementioned package as a "kit" to compile the project.

@kshegunov I see, now i understand. Thank you for your help and for your patience.

Raised issue https://bugreports.qt.io/browse/QTBUG-49301

Solved from https://forum.qt.io/topic/17139/solved-how-to-use-ssl-support-without-manualy-building-qt-libraries/6

added CONFIG += openssl-linked
copied from the QtSdk the (MingW) libeay32.dll and ssleay32.dll in the same folder as the executable

Well, the plugin name is "simulator"