It seems to be missing from the HTML5 browser console, however it's still located in the older flash browser console, at least for the 7.10.2 version.  Access your older flash based console at https://<connectionserverurl>/admin, and it's located under the Catalog -> ThinApps.  And View Configuration -> ThinApp Configuration to add repositories, etc.  Even after adding the new ThinApp repository, it still doesn't appear for me in the HTML5 client.  It seems the only way to manage ThinApps, at least on 7.10.2, is from the older flash based Horizon Administrator console.  Hope this helps.