Steps to reproduce

Install Powershell Core (latest build) on a machine whose UI Culture is set to something other than en-US... In my case it's en-GB.

Run Update-Help from an administrator command prompt. Then try getting help on a basic command like help Update-Help -full. It will tell you that the help files aren't installed.

Expected behavior

Help files should be installed.

Actual behavior

Help files don't get installed.

Environment data

> $PSVersionTable
Name                           Value
----                           -----
PSVersion                      6.0.1
PSEdition                      Core
GitCommitId                    v6.0.1
OS                             Microsoft Windows 10.0.16299
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

I have worked around this by doing Update-Help -UICulture en-US, but I shouldn't have to do this. This command worked fine in Windows PowerShell.

One of the most amazing things about PowerShell is the rich help system. But if it doesn't work for a huge amount of users (anyone not in the US) then what's the point?

See this related issue: #5534