What (like URL Rewrite or ARR) are you trying to install? What Windows Operating System version are you targeting?

For developers who need to run this legacy tool, here are the final system requirements:

While Microsoft has officially retired the Web Platform Installer, many administrators and developers still require the Web PI 5.0 64-bit download to manage legacy environments, configure older IIS servers, or deploy specific dependencies that are difficult to package manually. What is Web Platform Installer 5.0?

Web PI 5.0 will attempt to download the latest feed from Microsoft. Since the official feed URL is dead, you will likely see an error: “Unable to download the product list from the Microsoft Web Platform.”

Because Microsoft officially sunsetted the Web Platform Installer product line, finding the original download links on the official Microsoft Download Center can be challenging, as many direct landing pages redirect to modern documentation. 1. Official Microsoft Visual Studio/IIS Documentation Links

Before looking for a download link, it is crucial to understand the current lifecycle status of this software.