We'll do some testing to see if we can replicate any issues with the Windows import in the new release. In the mean time, all you have to do to import Windows games is simply drag the shortcuts onto the LaunchBox interface.
Yes, we were aware of that false positive. We generally don't work at getting around anti-virus false positives for the beta releases, but we do for the officials.
I've seen that recently from one other user as well; unfortunately it's a video driver bug that causes it (and was mostly fixed for the other user with a video driver update). Can you try updating your video drivers?
You can safely install 11.2 directly over top of your LaunchBox folder. Not the Core folder, but your original LaunchBox folder. Watch carefully though in the installer, because if you browse to a folder, it will automatically put \LaunchBox on the end of it (which makes sense for new installs). Just check the text box after browsing to make sure you've selected the correct folder and not a LaunchBox\LaunchBox folder.