Rebuilt a Win8.0 Notebook then updated to 8.1. There were over 100 updates to do, quite normal. Of those updates there was a list of 19 Optional updates but only 1 was automatically checked to be installed and that was for Win10. To get all the updates installed the one for Win10 had to be unchecked as it was the first to start downloading, obviously would take awhile to get the 2.7GB. Seems Microsoft is becoming more aggressive in getting Win10 on computers.