What did you purchase, exactly?
As per your account information, I see that you are a subscriber of Adobe PDF Pack subscription.
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.
I assume that you have been trying to access your PDF Pack subscription through wrong application Adobe Acrobat DC not Reader DC?
Please ensure that you are working with Adobe Reader DC not Acrobat DC to access PDF Pack and "Signed In" using correct email.
Could you confirm how you have been trying to access the service?
For any troubleshooting, refer to- https://forums.adobe.com/docs/DOC-8841
Let us know if it still doesn't work for you.