So you clicked on "Start a free trial" and filled out the form? You should get an email as well then with details and who to contact if the download didn't work. There is no direct download without filling out that form.
If you are a licensed user and just need the download, then you should be able to download from your "My Alteryx" portal. You will also see in there as to who your reps are that can help from Alteryx.
