Click the Start a free trial link to start a 15-day SaaS trial of our product and join our community as a trial user. If you are an existing customer do not start a free trial.
AppDynamics customers and established members should click the sign in button to authenticate.
We notify the customers seven days prior to the expiration date of your license. Looks like you have missed the email notification about the license expiry from AppDynamics.
We recommend that you check your emails associated with AppDynamics account.
For more information on License management, see the KB article.
Hope it helps.