Looking for Acrobat 8 Professional download site

I own Adobe Acrobat 8 Professional.  I have a new laptop computer, Dell Latitude PC, windows 10.  It does not have a CD player so I need to download it from Adobe.   WHERE do I go to find something that lets me simply download the version I want?  The screens say, get the serial number.  I have the serial number.  All I want is someplace to enter it -- since you seem hellbent on having it -- and then I want to download the thing to this new laptop.  Is that so difficult?  How about a 1-2-3 list that gives some useful fields and information?