To install these anyway, you need to have had them installed on the Release Preview or on the Consumer preview before. The steps are pretty simple, one open the Appstore in Windows 8.
Two Swipe down from the top (or rightclick while your mouse is at the top or bottom of the screen) to make the "Your apps" option appear.
Three Choose it and you'll see all the apps ever associated with your account.
Four Flick-select each app you were still missing and pick the install option from them bottom bar.
Five Now be patient while your apps download.