I have a DVD copy of (and license key) for Acrobat 9 Pro Extended, but just bought a new computer that doesn't have a disc drive. I've looked on the Adobe site and the only things I can find are updates for it, or Acrobat DC (which I believe is a different product) (which also doesn't work with the license key I have).
There is a page for Acrobat 9 downloads here Download Acrobat 8 and Acrobat 9, but I only see Pro not Pro Extended. Odd, because, as you point out, it's possible to get all the updates (Adobe - Acrobat 9 Pro Extended : For Windows).
This discussion thread may help: Re-installing Acrobat 9 Pro Extended, Windows. It gives instructions on how to get the installers from the disc you have onto your computer by copying the contents onto a flash drive.
Let us know by reply if that helps you get Acrobat Pro 9 up and running again or if you need additional assistance.
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