Cause: PowerShell 7 has stricter parsing, different default behaviors (e.g., -ErrorAction defaults). Fix: Use #Requires -Version 5.1 at the top of legacy scripts, or run them with powershell.exe explicitly.

Solution: PowerShell 7 requires the PSGallery repository to be trusted:

After upgrade, verify with pwsh --version . This is the most common “upgrade” scenario for Windows users. No direct in-place upgrade exists, but you can migrate.

winget install --id Microsoft.PowerShell --exact --silent Winget automatically fetches the latest stable version. If you have the .NET SDK installed:

To see both your old and new versions:

brew upgrade powershell :