PhotoStructure PLUS licensing requires your browser to be able to access both the computer hosting PhotoStructure as well as https://account.photostructure.com/
You can configure your firewall to prevent your PhotoStructure computer (or VM or docker container) from making any outbound network calls, and everything should “just work.”
If you use Docker, the license should work on that host even if it’s subsequently moved to another network.
Note that licenses are self-contained, and are valid for the period of your subscription, so the computer can be wholly air-gapped for this duration and PhotoStructure should continue to function.
If this isn’t working for you, or you have a different situation, feel free to reply to this topic or chat on discord, we’ll get things sorted!