There are countless reasons why you could run into installation problems. Some things to try: Make sure you're on the latest version of Windows by running Windows Update. Learn how to address the "Forbidden by system policy" issue, if present. Check whether your antivirus has flagged the app as a threat. Restart your computer and try again. Download the app again and reinstall it. Find the contact info for the developer of the app, or the forums, and post about your issue.
Alternatively, you can try installing software on the command line using Windows Package Manager.