Take your USB drive (or written code) to the computer that does have internet access.
For IT administrators managing multiple offline machines, Adobe provides command-line activation using the adobe_licensing_tool:
adobe_licensing_tool --offline --request --serial=<serial> --output=request.txt
Then process request.txt on an online machine and apply:
adobe_licensing_tool --offline --response --input=response.txt
The process of offline activation for Adobe Acrobat Pro DC 2020 involves a few steps:
Enter the Activation Code: Once you receive the activation code, enter it into the appropriate field in the Adobe Acrobat Pro DC 2020 activation window. This should confirm your offline activation.
Benefits:
Limitations:
Even with perfect steps, errors happen. Here are the top three for Acrobat Pro DC 2020 offline activation.