The PowerShell ISE is with Windows PowerShell 5.1. You do not need to download it separately. If it is missing, enable it via Windows Features :
If you are running Windows 10 or Windows 11, the PowerShell ISE is likely already installed on your machine. You do not need to download an installer from a website. powershell ise download
: Available on macOS and Linux. Installing the PowerShell extension provides a similar development experience. The PowerShell ISE is with Windows PowerShell 5