El Capitan downloads something in background

Hi everyone,

I just updated my Yosemite to the latest El Capitan (v10.11.1) in a MacBook Pro Early 2011 and its working fine. But I have a problem, when I connect it to the internet through WiFi, there is a download starts and its running always in the background, and I couldn't find what is it downloading. Further, I have installed all the updates, and no updates are pending to be installed. But, the download doesn't stop and its still running.

By the way, I have a paused download of Yosemite in the App Store Purchased tab. doest it affect in this background download? or what is the reason for the background download? How can I stop it?

NB: I couldn't check for an ethernet or USB dongle internet connection, because there is no drivers available for my internet dongle. (Huawei E153)

Thanks in advance.

Zumri Hadhi