Licensing & payments · The free trial
What does "You're all set — this Mac already has an active trial" mean?
Short answer: Storage Studio recognised this Mac already has a trial, so there's nothing to register. Click Continue; your remaining days carry on unchanged.
It means Storage Studio recognised that this Mac has already started a trial, so there's nothing to register again. Click Continue and pick up where you left off.
This usually appears after a reinstall or on a Mac where someone already set up a trial. Your remaining trial days carry on as before; reinstalling doesn't add or remove any.