Hi!
Hope you are doing well and thanks for reaching out.
Adobe always recommends downloading and install the latest available version of Acrobat or the freeware Acrobat Reader app to get the latest features and security updates. You can always download the latest version of Acrobat Reader from the URL: https://get.adobe.com/reader/enterprise/
However, if you still wish to install the older version, you may use the following URL to download & install the freeware Acrobat Reader:
Win: ftp://ftp.adobe.com/pub/adobe/reader/win/
Mac: ftp://ftp.adobe.com/pub/adobe/reader/mac/
https://www.adobe.com/devnet-docs/etk_deprecated/tools/ReleaseNotes/index.html
For technical specifications of Acrobat Reader, please see this article: https://helpx.adobe.com/reader/system-requirements.html
For an older version of Acrobat Reader, please see this article: https://helpx.adobe.com/reader/system-requirements-old-versions.html
To know more about Acrobat Reader, see this: https://helpx.adobe.com/acrobat/faq.html
I hope this helps.
Thanks,
Anand Sri.
(Edited response)