Hey Sergey,
We cover this in-depth in the FAQ "How can I completely hide the updater (wyUpdate)?". We've just updated the answer to that question to go further in depth in the various options. If you don't want to create a dummy Windows Service to do the completely silent updating, then see the "Hide the slow steps (option 2: standalone wyUpdate)" section.
In wyBuild 2.7.x or 2.8.x we're adding a drop-in solution for completely UI-less updates. However, we still recommend exposing a UI to your users.
Tell me if this helps.