Did you use 7-Zip to unzip as they specify ?
Extract the executable from the zip file and run the Win32DiskImager utility; you may need to run this as administrator. Right-click on the file, and select Run as administrator. ( If you find that the download appears to be corrupt or the file is not unzipping correctly, please try using 7-Zip, which is bundled and have been installed along with Ch. For Windows 10, left click the lower left corner to bring up the Windows 10 user interface, hold the left button and scroll down to find “SoftIntegration Ch Professional”, then click “7-zip File Manager”. For Windows 7, click the command “Start”, “All Programs”, “SoftIntegration Ch Professional”, “7-zip File Manager”.)