Anyone that could help me find installation files for Acrobat Standard 8?

I am trying to find and download installation files for Acrobat Standard 8 - I have the serial number - but I can only find the files for the Professional version, unfortunately. Anyone know where I can find for Standard version?

I have used this link but it only gives me the professional version, unfortunately:

http://helpx.adobe.com/acrobat/kb/acrobat-8-9-product-downloads.html