There could be several simple things to try. First, don't click and click. That only confuses the computer. Try rebooting your computer. This means that you log off and then shut down the machine. After it all goes black and there are no lights on, turn your computer off. Wait at least a minute and then turn the computer back on.
After the computer is back up and running, go on the internet and find the website. Try and click the download button. If it doesn't download, it might have a little line at the top of the page asking if you trust this website. This is your computer security system. Click on the yes or continue button.