@J-Hilk said in Installed Qt 5.15.0, but I got Qt 6.2.2:

@JKSH in the about Qt CREATOR window of QtCreator of cause, like most other misunderstandings regarding "Qt versions" :P

Ah, of course... I should've known better 😅

@Joshika_Namani said in Installed Qt 5.15.0, but I got Qt 6.2.2:

after installation its showing its version as 6.2.2

The Qt Creator's "About" box shows the version of Qt that was used to build Qt Creator.

It does not show the version(s) of Qt that you use to build your projects.

in tools->options->kits its showing Qt 5.15.0 GCC 64 bit.

Then your projects will be built using Qt 5.15.0.

Note: You can install multiple versions of Qt and use them all in a single version of Qt Creator. Does this make sense?

You can try compiling QtOpcua module using your Qt 5.6 toolkit and toolchain. If that works, then you should be able to deploy it to your device and use it in your project. If it does not work, then find a different board ;-) Or perhaps use linuxdeployqt to create a self-contained package that will shich Qt together with it. I have no idea if this will work on an embedded device - it's definitely not a standard use of this tool.