Because if you go to the Avast webpages, all the links you will find (or at least I could find) just direct you back to download,com (aka CNET) for the free version.
Good. I'm not blind then. I'd looked for a direct download, but only saw the link to CNET. I gave up after a bit & just went to CNET. I'd figured with their last fiasco that they'd smartened up a bit and would continue in kind. Guess not.
If it's free, YOU are the product.