unable to open Adobe DC reader. Getting a "Acobat failed to connect to DDE server"

Hi haroldg88489577,

Try to repair Adobe Reader DC from the Control Panel in Windows.

If you still experience the issue, uninstall the Adobe Reader DC using cleaner tool: Download Adobe Reader and Acrobat Cleaner Tool - Adobe Labs in Windows and simply uninstall and drag it to thrash folder in Mac

Then download Reader DC from here: https://get.adobe.com/reader/

Let me know if this works for you.

Regards,

Meenakshi