Did you find it in the C:/windows:/Softwaredistribution folder?And what could the name of the file be?

Thanks Paul, I'll try to find the same.....

Yup.....it was a live upgrade...........Thanks BTW

I downloaded the 2.7 GB Windows 10 update. After which I was required to restart the PC. On restarting I am again being asked to download the same 2.7 GB Windows update file. What could be the reason...