As per the description above, you are not able to access the Adobe PDFPack services, as it asking you to pay again, Is that correct?
The Adobe PDFPack subscription is an online Document Cloud service and it can be accessed through a browser and through the free desktop version of Adobe Reader, but it cannot be downloaded as an application on a computer.
Access the services through the URL https://cloud.acrobat.com/convertpdf with your Adobe ID and password on a browser like Chrome, or Firefox, or Safari.
If you want to use the services through Adobe Reader, just "Sign-in" with your Adobe ID and password in Adobe Reader DC, to download Reader DC, use the URL Adobe - Adobe Acrobat Reader DC Distribution
For more troubleshooting, please refer to Troubleshooting Create PDF, Export PDF, Adobe Send, Fill & Sign … services(PDFPack or Document Cloud...
Feel free to update this discussion in case you need further assistance.