unable to download and install product bought through amazon

it's not clear what you bought but acrobat reader is free, Adobe Acrobat Reader DC Install for all versions

acrobat pro and acrobat std are not free, but you'll need a serial number to activate beyond a trial installation:

Single user licensee downloadable installation files available:

• Suites and Programs:    CC 2018 |  CC 2017 |  CC 2015.5 | CC 2015 | CC 2014 | CC | CS6 | CS5.5 | CS5 | CS4, CS4 Web Standard | CS3
• Acrobat:  DC, XI, X | X,X suite,9,9 extended | 8 | 7 |
• Authorware:  7.01 windows |
• Captivate:   10 (2017) | 9 | 8 | 7 | 6 | 5.5, 5 | 1
• Cold Fusion:  11, 10 | 9.0.2, 9.0.1, 9.0.0, 8.0.1, 8.0.0, 7.0, 6.1, 6.0, 5.0, 4.0 |
• Contribute:  CS5 | CS4, CS3 | 3,2
• FrameMaker:  12, 11, 10, 9, 8, 7.2 |
• Lightroom:    6.14| 5.7.1|  4.4 | 3.6 | win 2.7, 1.4.1 | mac 2.7, 1.4.1 |
• Photoshop Elements:   2018,15,14,13,12,11,10,9,8 | 9,8,7 win | 8 mac | 7 mac
• Premiere Elements:   2018,15,14| 13,12,11,10,98 | 7
• RoboHelp:   2015, 11, 10, 9, 8

Updates

• non-cc updates
• CC (2013) Updates:
• •   Windows
  •   macOS
• CC 2014 Updates:
• •   Windows
  •   macOS
• CC 2015 Updates:
• •   Windows
  •   macOS

• Download and installation help for Adobe links

• Download and installation help for Prodesigntools links are listed on most linked pages.  They are critical; especially steps 1, 2 and 3.  If you click a link that does not have those steps listed, open a second window using the Lightroom 3 link to see those 'Important Instructions'.

And a big thank you to Jim @ Prodesigntools for helping me with these links!