Might be a fire-wall problem. Can you disable the firewall or try over a different internet connection? Might also be worth searching here or the internet on firewall issues with installation of Julia packages.
You could also ask your sys-admin.
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I fixed it, just had to update PowerShell
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Cool. Add a “Solution tick” to your own answer. That way other people will know that they don’t need to look at this tread anymore.