Hi Alexander,
Kmz ->Topojson
Results does not see in QGIS, conversion succeeded.
Link to screencast:
Attached samples: input/output/QGIS.
Bug 4571 KMZ to TopoJson -results does not see in QGIS, conversion succeeded…...TopoJSON format does not support 3D geometry, but input Kmz have...support 3D? If yes, will be in May. Or you will support 3D, if yes...