Hm, I found it as separate install in Qt Maintenance tool. THe problem is - It's installing with such errors: (qt.55.qtscript.win32_mingw492): Could not find the needed QmakeOutputInstallerKey(qt.55.win32_mingw492_qmakeoutput) value on the installer object. The ConsumeOutput operation on the valid qmake needs to be called first.
but my problem is with the installer script (sorry for not having explained before (-_-)). The application is fine according to the customer feedback.
Am trying to check the existence of previous installations and if so, check which version is installed. For this, I have created a registry entry containing the application path and installed version, but I don´t know how to compare the current installation version with the previously installed one.