Then I downloaded the installer for version 21.007.20099 from get.adobe.com/reader. As shown in the screen shot below, I declined all the optional features (McAfee Security Scan Plus, McAfee Safe Connect and the Chrome Extension). Note that under the blue Download Acrobat Reader it says that the download is 263MB.
Developers can purchase support via the Adobe Creative Cloud Exchange Developer Support program. Supported SDK development activities include those for which the product is designed, tested, and licensed. Acrobat Developer Support does not support use cases that do not involve the Acrobat core API.
But you still need to create for every different domain a new credential pair to enable this functionality?
Or are their any "hack" if you use for example the .adobeaemcloud.com domain (what is used as your main domain)?
The Adobe CC software is available to the UNC-Chapel Hill community through an Adobe Enterprise subscription model. To begin the installation process, you need to uninstall all old Adobe products from your computer. To uninstall the Adobe software, visit the adobe.com article: Use the Creative Cloud Cleaner Tool to solve installation problems.