Hello and welcome to justanswer. My name is***** will be assisting you today. I am sorry to hear that you are having such trouble. I will try my best to help you.Could you please provide the following details.
Which version are you trying to install acrobat 9 standard or professional?
Do you have the disc with you?
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Please answer my above questions so that i can help you better.
Reply using the box below
Checking to see whether you still need help.
Thank you for getting back to me.
Did you upgrade to Acrobat 9 pro from Acrobat 6 ?
I am not familiar with the functions of Wondershare PDF element but i found a link to download Acrobat 9 professional,Please click on this link to get it : - http://tinyurl.com/y8zptm3
Download and install it,during the installation it will ask for the serial key which i believe you already have.Enter it and it will activate.Please check it and let me know.
I believe that will allow you to download and install Acrobat 9 pro version on your computer.
Let me know if you have any further questions,If you do not have any further questions please rate me using the rating options (stars) on the top of this page, select the rating and click on submit. If you need any help in the future please use this link to ask for me http://www.justanswer.com/computer/expert-john/
That is strange but i apologize for that.
Please use this link : - https://helpx.adobe.com/acrobat/kb/acrobat-8-9-product-downloads.html select the correct version from that link and try it again and it will work.
Check it and let me know