None of those links download anything compressed as a Zip archive, so there's nothing to extract. Don't attempt any modification of the .ispw file you will get. Once downloaded, install it by Option-clicking the Update button (Shift-click in Windows) in iTunes - make sure you have iTunes 10.5 - and choosing the downloaded file.
By the way, no one gets paid to help here - we're all just fellow users helping out as we have time - so posting the same post over and over won't get you a response any faster, and in fact may just irritate people and make them less likely to want to help you. I understand that you would like to get your iPad updated, but you need to have patience and wait for people to respond.
Regards.