Cannot Activate your Derwent Data Analyzer License On-Line?

Occasionally, a situation comes up in which the Derwent Data Analyzer license cannot be activated on-line.  Sometimes a firewall gets in the way, or your institution's security policy does not allow it.  If you have access to e-mail, you can still activate Derwent Data Analyzer using the procedure described in this guide:

How to manually Activate your Derwent Data Analyzer license (by e-mail)