NaCl downlaod is failed

I had a Samsung TV app made with NaCl before, so I installed Tizen Studio and installed Extension SDK as TV Extension Image -5.5 to modify this app again.
However, when I create a project and select NaCl and proceed,
In the Select Toolchain section,
When I select pepper_xx and click the download button,

Failed to download the NaCl toolchain (I/O Error: sdf.samsungcloudcdn.com)

This error pops up and the download fails.
What is the reason?
Python 2.7.15 is installed.
I would like to know another way to install pepper_xx.

Hello,
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