gistfile1.txt

Invoke-WebRequest `
    https://s3.amazonaws.com/ec2-downloads-windows/SSMAgent/latest/windows_amd64/AmazonSSMAgentSetup.exe `
    -OutFile $env:USERPROFILE\Desktop\SSMAgent_latest.exe
    
Start-Process `
    -FilePath $env:USERPROFILE\Desktop\SSMAgent_latest.exe `
    -ArgumentList "/S"
    
rm -Force $env:USERPROFILE\Desktop\SSMAgent_latest.exe

Restart-Service AmazonSSMAgent

// GO TO https://us-west-1.console.aws.amazon.com/systems-manager/quick-setup/?region=us-west-1
// IF existing quick setup exists, select it and click "view details", at top right click "actions" and then click "Edit configuration options"
  // IF its done by tag, ( add tag to instance ) 
  // IF its done by resource group ( add instance to group )
  // IF its done by manual selection, select the instance and click update.