Same issue but this Microsoft response worth reading

"This is an expected message indicating that when installation begins it may require user interaction. This is the largest software upgrade event ever and we?re managing it so everyone has a great experience. We recommend waiting until your PC receives a notification to upgrade, and then following the instructions provided.

Please note that there is no problem with your reservation or upgrade download. The upgrade download is not corrupt as some have stated, and you will be notified in the coming days or weeks when your device is ready to upgrade".

Posted By: Jack Flash, Aug 1, 13:58:50