It is a known issue that the 64 bit SampleLauncher from the SDK is currently broken, you can download the working standalone version here.
As for Qt Creator:
I just set up a fresh KaOS installation and tried installing V-Play. Qt Creator works fine and I was able to build and run V-Play projects as expected. (both when starting Qt Creator from bin via console or normally). When running Qt Creator from bin I also get the “Unable to determine KDE dirs” message, which doesn’t seem to be a problem. I guess the main issue in your case is the Segmentation fault.
You can also try installing the latest Qt version from qt.io and see if the official qt distribution and Qt Creator works. If you get the same error there, the problem is not V-Play related but a general Qt problem with your setup. Maybe someone in the official Qt forums can help you out in this case.