Help me. I can not download json file

Hello, I can not write English well. I am Japanese.
I want to use a XIAO but I can not download https://files.seeedstudio.com/arduino/package_seeeduino_boards_index.json.
Could you tell me how to download json file?

I tried these things.
1 I read Getting Started with Seeeduino XIAO - Seeed Wiki .
2 I input json file link in setting.

Did you add the seeed json link in the Preferences area?

You can also download the seeed “board files” from the seeed github and add them manually in the Arduino “hardware” folder.

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