Unfortunately, even if the older version is successfully restored, the user can still be left with a painful hole in the pocketbook. The Windows 10 upgrade can take up to 10 gigs of the users data allowance. The millions of users out there working under capped data allowances could see an expensive surcharge from their carrier even if they decline the agreement and have their older version restored.
What?
No, I don’t think anybody’s talking about mobile phones here. This is desktop computer stuff. The biggest expense, if you’ve approved the update and it gets installed, is if you have a 40 GB hard drive. You’ll need at least an 80 GB drive. Those are pretty cheap, and can easily be installed yourself even if you’re a computer newb.