As you may know, Microsoft and Adobe have partnered to provide a plugin for Adobe Acrobat (DC and Reader DC) to use Azure Information Protection (AIP) (see https://t.co/aPiqMBE6XZ).
Well, a new version of the plugin (19.021.20047) has been released and is available for download from https://helpx.adobe.com/au/acrobat/kb/mip-plugin-download.html
On this page you will find all plugin version, for Adobe Acrobat DC or Adobe Acrobat Reader DC both for Windows and Mac.