While some sites claim to offer "cracked" serial numbers or keygens, using these carries significant risks: Character Creator 4 - Is it Worth Buying? (Review)
For modern versions like CC4, the Reallusion Hub manages your installations and often handles activation automatically once you log in with your account credentials. Risks of Using Cracked Serial Numbers
A Character Creator 4 serial number is provided upon the purchase of a software license. Reallusion currently offers several ways to obtain and manage these keys:
Search your inbox for a purchase confirmation from Reallusion; it typically contains your serial number.