Correct me if I'm wrong in my understanding that another way to obtain these GDNS activation code and password is to visit the Guardian Digital Secure Network Registration page to obtain one. However, I can't seem to find the option or link to get one.
We have moved the getting a GDSN activation code to the inital config of the WebTool in EnGarde 3.0.17. IOW once you installed EnGarde 3.0.17 then log into the WebTool you will be able to create a new GDSN account. Note that you need to have internet access setup while doing the install. Once you created a account in the initial configuration of the WebTool you will be able to install updates and get new packages.