I am downloading the 4.0 .exe. However, I when I launch it, I am getting an error message and the process of implementing the new software aborts. Please help.

After about 12% extraction, I am getting a "Can't open extraction file".

If you're not a developer then you really should not have upgraded.
I'm unsure how you can fix this as you have already done a back-up on iOS 7 and apple don't support firmware downgrades.

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