Please clarify if:
- Your airport are MISSING, this means the software hasn't loaded for some kind of reason ( antivirus, usually )
- Your airports are IN TRIAL, so everything is working, you just lost your activation.
If you don't see the airport, it doesn't mean it's in Trial. If you lose the activation, they airports will NOT disappear. It will go IN TRIAL. In Trial means they will WORK, but only for 5 minutes per session.
So, please always clarify this, because they are two entirely different issues that needs completely different troubleshooting.
If your case if of airport MISSING ( which doesn't mean "In trial", then continue this thread. If your case is the airport is in Trial and for some reason you cannot activate it, so it WORKS, but is stuck on Trial, do not post here, and contact support by email.