When you download and start using FileUltimate it already runs in trial mode in for first 30 days, so you don't need a trial key. The trial is only time-limited and not feature-limited, i.e. none of the features are restricted during trial. When the trial ends after 30 days, "unregistered" label will be displayed at the top right of the component.

If you need more than 30 days for trial, then we can provide a trial extension key when your trial ends.