In Windows PowerShell, I get an error while calling "DownloadFile" and cannot build.

[DiamondGotCat]

Hi, I read the Japanese article and tried to build Malmo.
However, Windows PowerShell shows an error while calling "DownloadFile" for a moment and I cannot build it.
Can I use Malmo in this situation?
If so, I would like to know how.
Thank you in advance.

Here is the command we executed:
.\malmo_install.ps1

Here is the site I read:
https://hitomevorecraft.org/archives/438