Start-Process: ... The parameter is incorrect.

[MessiInter]

Describe the bug

The script can't elevate itself. Start-Process : This command cannot be run due to the error: The parameter is incorrect.

To Reproduce

Steps to reproduce the behavior:

1. Open Windows PowerShell
2. Type irm https://christitus.com/win | iex
3. Execute the command.
4. See error

Expected behavior

Start-Process : This command cannot be run due to the error: The parameter is incorrect.
At line:68 char:5
+     Start-Process $processCmd -ArgumentList "$powershellcmd -Executio ...
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [Start-Process], InvalidOperationException
    + FullyQualifiedErrorId : InvalidOperationException,Microsoft.PowerShell.Commands.StartProcessCommand

Screenshots

Additional context

OS: Windows 10 1709
Arch: AMD64