Before you do this, have you verified that your specific system model is on the Dell validated Windows 10 Anniversary Update list?
My laptop is setup to automatically update to the latest version of Win 10 which I think is the Anniversary addition, when I select the updates menu. After 4 hours only 6% had downloaded so I had to cancel the update. I found something on the Win 10 site which says I can select the option to Defer Upgrades, by the Win 10 I have on my Dell does not have this option available. I am concerned that I am not getting all the security patches I need, but I cannot have my laptop downloading Win 10 anniversary if it is going to take over 24hrs to download. Suggestions please, getting desperate. Thanks
Win 10 Update Taking ages to dowload