If you want to update to Windows 10 Anniversary update now and Windows Update keeps saying you’re already up to date, then do the following…
Visit this webpage:
https://www.microsoft.com/software-download/windows10
You should see a notification about the update on top of the page. Just confirm it and you’ll download a small tool that will begin the Anniversary Update right away without waiting. For some reason I managed to update my system on 2nd August 2016 via Windows Update, but I have to update both my laptop and tablet via this tool for some reason.