I’m running Windows 7 Ultimate, the Installation Wizard finishes but installs nothing due to an interruption. Last time, after the download finished, I shut down my virus and firewall and wireless connection. Still got interrupted.
Look at the downloaded file. If the extension is different to “.msi”, replace the extension by “.msi” and try again. If this does not work, please report all steps and their results to enable understanding what is happening on your PC.