Error when install Radiomics extension

I got “Failed downloading: http://slicer.kitware.com/midas3/download?items=366963” when I try to use Extension Manager to install Radiomics.

I am using windows 10 64 bit. Slicer 4.9.0-2018-06-17.

Could I download this software somewhere else and install manually. Thanks for your help.

Tom