Install additional modules to the Open source version (6.2.3) example QtMqtt under Windows 10

[MarioFromAlassio]

Given the procedure I followed and it worked, if it helps:

install QT if not already installed

add to the path:
a) C:\Qt\Tools\CMake_64\bin
b) C:\Qt\6.2.3\mingw_64\bin
c) C:\Qt\Tools\Ninja

Install Strawberry Perl

Delete from path
a) C:\Strawberry\c\bin

from command line:
a) cd C:\Qt\6.2.3\Src
b) C:\Qt\6.2.3\mingw_64\bin\qt-configure-module.bat qtmqtt
c) cmake --build .
d) cmake --install .

Note the . (period) at the end of the cmake commands

Done.