The download takes around three hours, trashes some of your programmes, wipes out your anti-virus programme, Cortana does not work in the UK and it has a plethora of other negative issues. I recommend you read reviews of what others say about it before you even consider downloading it. If you do download and are not happy with it you have exactly one month from the date/time you downloaded to revert back to your previous system, through 'system restore', which takes three minutes, otherwise you're stuck with it. Also, if you have 'reserved' W10 and leave it until the end of the time that it's free, July 29th, it will download automatically if you have 'automatic updates' turned on and the only way to reverse the reservation is to go into your control panel and look at the available updates and uninstall the one that is ticked as 'important', the update is KB3035583.
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