You can always open the dataset using h5py. Try this in a python shell:
f = h5py.File('<path_to_datset>')
print(f.keys()) # List of sources in the dataset
print(f[f.keys()[0]]) # First source
print(f[f.keys()[0]][0]) # First value stored for the first source
Try to check if the data you downloaded is uncorrupted, I suspect that the problems might be here.
BTW, the best way to represent textual information is text, just copy and paste the error log in the future.