There are several cases when an Internet connection may not be available or possible:
Companies or institutions that only allow email
Special networks that are offline on purpose
Problems with the network connection (due to proxy servers or firewalls, for example)
Hexagon SPA created a procedure to automate, as much as possible, the offline activation process.
Use this email address for the offline activation process: activation@hexagon.com
More:
Offline License Transfer and Activation Process Overview
Getting the Offline Activation Start File via email
Creating an Offline Return Request File
Getting the Offline Return Response File