I've been trying since yesterday to factory reset my iMac, Erased everything on the hardrive. 
Reinstall Mac Os X > Apple Store Connect with Apple ID > Downloading additional Components.
It goes from 31 minutes for the download to 42 hours, It was downloading all night it hasn't moved, I looked into (Command + L ) to check out the logs, it only shows errors.
https://twitter.com/BackpackMTL/status/748915508074786817?lang=fr
	
		
			
		
		
	
				
			Reinstall Mac Os X > Apple Store Connect with Apple ID > Downloading additional Components.
It goes from 31 minutes for the download to 42 hours, It was downloading all night it hasn't moved, I looked into (Command + L ) to check out the logs, it only shows errors.
https://twitter.com/BackpackMTL/status/748915508074786817?lang=fr
 
 
		 
 
		 
 
		