NSIS installer does not upgrade properly
When using the VLC 3.0 installer to upgrade a VLC 2.2.x install, it will detect the old VLC properly (if it has the same bit-ness) and „upgrades“.
This is not a proper upgrade though, it just means it will overwrite the existing files but it does not clean up the old ones that are present in VLC 2.2.x but not in 3.0, so if I upgrade, I will still have the old qt4 interface module dll, for example.
This can cause some problems: