You have a legitimate license for Adobe Acrobat Pro DC, but you cannot connect to the internet to "phone home" and verify it.

The process described below applies to of Acrobat Pro DC and is provided for informational purposes.

Install Acrobat on the machine that will be offline.

When you first install Adobe Acrobat Pro DC, you're required to activate the software using an internet connection. This activation process verifies that you're a legitimate user and helps Adobe to prevent piracy. Once activated, you can use the software without an internet connection, but there are some limitations.