It is marked Assumed Answered...why? It is not.
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Not a download. Just a service. Sign in using Acrobat Reader.
As per the description above, you want to download and install Adobe ExportPDF service, Is that correct?
As Aandi correctly mentioned that you can use the service of Adobe ExportPDF with free desktop version of Adobe Reader DC, just "sign-in" with your current Adobe ID and password in Adobe Reader DC to use the service of ExportPDF.
You can also use the service through online URL https://cloud.acrobat.com/exportpdf with your Adobe ID and password on a browser like Chrome or Firefox, or Safari.
Online services like Adobe ExportPDF cannot be downloaded as an application. But we can access the services through a browser and can be accessed through desktop and mobile app Adobe Reader DC. To download Adobe Reader DC Adobe - Adobe Acrobat Reader DC Distribution
For troubleshooting, you can refer to Troubleshooting Create PDF, Export PDF, Adobe Send, Fill & Sign … services(PDFPack or Document Cloud Services).
Feel free to update this discussion for any further assistance.