I had created company hub app for Win Phone 8 where signed xap is downladed from a url on mobile devices with preinstalled AET token.
But I am not able to find similar mechanism for distributing Windows10 UWP/ Windows-10 mobile app.
How can this be achieved? How to distribute WP10 apps without using store.
Amit, with Windows 10 (Mobile) you still have the option to distribute your app via Company Portal (e.g. the name for Microsoft Intune Mobile Application Management app for users to get internal company apps). With Windows 10 Mobile you don't need the Symantec certificate anymore.
In addition, you can distribute your app through Windows Store for Business web portal new with Windows 10 devices (please see http://businessstore.microsoft.com).
Please let me know if this helps.