Will Win 8.1 be available as a CD or one big transferrable download?

My only Win 8 computer is a desktop and only has dial-up internet access for any updates. Right now I don't bother updating it as it's so slow.

I was wondering if the update to Win 8 (so called Blue, or Win 8.1) will come in a CD form or maybe a download I could get with my XP from a hot spot and transfer to the Win 8 desktop?

Thanks

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