As per your account information, you are a subscriber of Adobe PDF Pack.
Adobe PDF Pack is an online service that you can use online via https://cloud.acrobat.com/convertpdf or through the desktop application Adobe Acrobat Reader DC- Adobe Acrobat Reader DC Install for all versions
You just need to “Sign In” using the email under which you have subscription registered.
Make sure that you are working on the correct application Adobe Acrobat Reader DC not the Adobe Acrobat DC.
Hope this helps.