Yes, for any version of Dragonfly installer that you have downloaded or got from a colleague, you will need to get trial license keys. But if you have requested a trial version from the Dragonfly website, you will have received such trial license keys.
When your trial expires, you need a license key to activate Dragonfly to continue using it. It could be either a perpetual general-purpose license or an annual non-commercial license. Please contact sales.dragonfly@comet.tech in order to obtain license keys for Dragonfly.