@astoffregen

we included this already

Oh, my bad, I overlooked that. Furthermore, "not installed" points more at deployment being the issue.

What I don't find explicitly in the CMake file, is main.qml.
So I guess it is sort of implicitly added as a resource and main.cppknows how to find it.

=> Is a qmldirdirectory in the resource tree?
Something along the lines of this might help:

install(FILES ${CMAKE_CURRENT_BINARY_DIR}/qmldir DESTINATION "${INSTALL_DIR}"

In the installatiopn are some plugins missing.