It is not clear what application you mean when you say Adobe 9 Pro Extended, so it ois not certain if it is available for you to download. If you can diownload it, it will only be valid for a 30 day trial unless you already own it and have a serial number to activate the trial with.
You can search the following site and see if you can find the trial version to download... this site is the only likely place you might find the software available for download.
If you find it there, be sure to follow the steps outlined in the Note: Very Important Instructions section on the download pages at this site or else the download will not work properly.
My mistake, question should have read Adobe Acrobat 9 Pro Extended. And I have learned that in order for Acrobat to work on Windows 8 I will have to upgrade to Acrobat XI Pro. 30 day free trial is available from Adobe. Thank you for responding. Checked out predesigntools web page you suggested, will add to my favorites, could be very handy.