Thanks for your question.
The activation code requires internet access to contact our license server for the initial registration process.
If you have a permanent activation code, but your computer does not permit internet access, I would suggest we generate a permanent Flexnet License key.
We just need your computers' Ethernet Address (i.e HOSTID) to generate a Flexnet license key. Here's how to get your HOSTID, https://support.numericalinnovations.com/a/solutions/articles/14000040204
Once you have your HOSTID, fill out the following form and you will receive a permanent Flexnet license key that will run only on your computer (no internet is required). Here's the license request form link, https://www.numericalinnovations.com/pages/license-key-request
Note: After receiving a permanent Flexnet License key, the Activation code will be disabled.