What you're seeing: the code itself.

What you need to do: go Back and click on the download link in whatever way your Firefox handles "Download Linked File" in the Contextual Menu.

If you've no such command, go get the FireFox extension "Menu Editor" and add it.

Next, be aware that you have forked up the star ratings (on the front page and elsewhere) for this product for some time to come.

Your job is now to make this up to the developer, right here, for future readers of this page. You figure out how. Do it.