There is no official, built-in "reset" button to restart a Bitdefender trial on the same account once it has expired. To continue using the software after a trial ends, you must either purchase a subscription or use a free version. Official Policies and Methods
Some users may want to continue using Bitdefender's features without purchasing a license. However, I want to emphasize that using a trial reset might not be the best approach: bitdefender trial reset
Your data is worth more than $20 a year. There is no official, built-in "reset" button to
New Account Creation: Bitdefender trials are often tied to a Bitdefender Central account. Some users attempt to reset the trial by creating a new account with a different email address, though this may be blocked by hardware ID tracking. Official Alternatives to a Trial Reset You cannot start any trial, even with a new email
Risks and harms