Mine didn't show up either so I clicked the "learn more" link on the WU page. that took me to the MS WU Anniversary update install page. I clicked the download "Get Anniversary update now" button & it DL a small installer file, I double clicked that & the Au started the DL, prep & install sequence. This has happened a few times for me while updating various W10 installs on a couple of my PC's
I had Pro here and decided to switch to Enterprise using a generic key and then the toolkit and I'm not getting the update either, I guess I'll just be patient. I heard AU is really broken so I'm gonna ask myself if its worth it for Halo 5 Forge. I remember having to reinstall windows 10 just to upgrade to TH2 so if it gets stuck again I'm gonna blow a casket.