Thanks for checking and that is interesting. How are you importing the data? When I go through File->Open and select the VTKHDF file directly the “Open Data With…” window pops up and does not show the VTKHDF reader as an option. I get the error I posted when I go into the File->Open and click the drop down and select the VTKHDF as the potential options then click on it.
Regarding the intended data, yes there will be time series eventually. This file is the static geometry but there will be other data sets included in additional files. The current plan is to have a separate file per time stamp but we might try out the temporal option.