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Unfortunately this is a problem already pointed out by other users.
If you are accessing the ISMN from China, the map may not be displayed, because of the restrictions for Google Maps by the Chinese government (http://ismn.geo.tuwien.ac.at/forum/index.php?p=/discussion/55/google-maps-is-not-supported-in-china#latest).
Anyway, the dataviewer (interactive map) is optimized for Google Chrome, so that is the recommended browser for navigation of the ISMN website.
Exactly, if you are in China and want to download those data you can not do it.
However, we can help you out: by telling us the area and the time-period you are interested in, we can get the data and send it to you.
Please write us an email with the above mentioned info at firstname.lastname@example.org, and we will come back to you.