It looks like it failed to download the dotnet executable. It’s supposed to do that the first time you start it up. You can try to download it manually and install it to the path listed.
Something like:
$Version = '2022.3.0'
Invoke-WebRequest "https://poshtools.blob.core.windows.net/vscode/osx.$Version.zip" -OutFile .\vscode.zip
$TargetDir = "/Users/rstolpe/.vscode/extensions/ironmansoftware.powershellprotools-2022.3.0/kit/osx"
Expand-Archive .\vscode.zip -Destination $TargetDir
Get-ChildItem $TargetDir -Recurse | Unblock-File
We have some instructions here: Installation and Licensing - PowerShell Pro Tools
I’ll open an issue to track this though since it’s not working automatically.