The downloads you've seen already are the "free" ones that Disney provides straight away. But when you complete your download, you will get all of these plus all the other photos you've observed in your account.
After you are done editing your photos with all of Disney's tools (borders, character signatures, etc.), then you finalize your download by ordering your complete package, usually a CD. Note: This is a final step. You cannot add photos after you do this, so please ensure that all your photopass cards are amalgamated under your PhotoPass Plus account.
As you complete the sale, it will appear that you will be charged for the CD. You will be asked whether you want your CD mailed or if you would rather download your photos. (International guests like me have to pay shipping for the CD, so I've been selecting the download option for years.) At the end of the process, your PhotoPass Plus account should indicate that a coupon has been applied to your account, which is the value of the CD / download. Unless you added other items to your "shopping cart", the net cost will be zero.
If you've selected the download option, the site will take a few minutes (or a couple hours) to prepare the link to the high resolution file dowload.
I hope this helps.