With time running out, I downloaded the Windows 8 Upgrade Assistant last night and ran it successfully.
I was given the option to purchase a download or DVD, and was prepared to go with the DVD.
However, I was presented with two payment options - Credit Card or Paypal (Both of which I have) but was a bit concerned when I noticed my connection at that point was not a locked https connection - so I aborted the transaction.
I would be very interested and grateful to hear from other experienced members and mods here regarding their method of purchasing the Windows 8 Upgrade, and whether or not I should be concerned about this.
I would very much like to purchase a DVD for $14.99 before the impending deadline.