: It featured an "Addon Wizard" that served as a central hub for managing aircraft and scenery.
: You can often use the software as a trial for free, but it will typically have limitations on the number of add-ons you can install until registered. Key Features of Addit! Pro
Because of its utility, a valid unlocks all these features, removes trial limitations (like 30-day expiration or watermarks), and provides access to technical support.