Can't install in windows. Invoke-Expression error

[pkoyado]

I'm trying to install in Win 11 for use with Visual Code GitHub Copilot. I've installed the latest version of powershell. When I run the irm command in powershell in the root of my repo I get back:

Invoke-Expression: Cannot overwrite variable Args because the variable has been optimized. Try using the New-Variable or Set-Variable cmdlet (without any aliases), or dot-source the command that you are using to set the variable.

I googled, then tried what that AI suggested: Set-ExecutionPolicy RemoteSigned -Scope CurrentUser, still doesn't work.
In other discussion I found someone said just run: npx skills add JuliusBrussee/caveman -a github-copilot and that did a bunch of stuff but even after restarting Visual Code and then typing /caveman or talk like caveman into my agent window, it basically came back with no idea what you're talking about.

EDIT: I was reading through the install.md that mentioned my error above and so I tried the other command it suggested of:
Set-ExecutionPolicy -Scope Process -ExecutionPolicy Bypass
but I still get the same error trying to install.

So, ..... how do I install this? What am I doing wrong?

[zhfldkkr789]

You can install it with npx -y github:JuliusBrussee/caveman