We're sorry for the delayed response and inconvenience caused. The record shows that you have an active subscription to Adobe ExportPDF service, and it is an online service which cannot be downloaded as an application on a computer. But you can access the services through a browser and can be accessed through desktop and mobile app Adobe Reader DC.
You can access the service through the URL https://cloud.acrobat.com/exportpdf with your Adobe ID and password on a browser like Chrome, or Firefox, or Safari and see if this brings any difference.
If you are using freeware Adobe Reader desktop application, then sign out from Adobe Reader, reboot the machine and sign back in and check for any pending updates of Adobe Reader from help>check for updates. Reboot the machine again after updating Adobe Reader and try exporting the PDF file.
For more troubleshooting, you can refer to Troubleshooting Create PDF, Export PDF, Adobe Send, Fill & Sign … services(PDFPack or Document Cloud...
Feel free to update this discussion for any further assistance.