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You might also find your answer in the LastPass Enterprise Manual.
How do I purchase or renew LastPass Enterprise?
Just getting started? Sign up for a Trial. To purchase LastPass Enterprise you must start with a trial. You can sign up for the trial at https://lastpass.com/enterprise_trial.php . You will be prompted to purchase licenses for Lastpass Enterprise at the end of your trial.
Purchase Additional Licenses. If you would like to purchase more licenses throughout the year, go to the Home Page of the Admin Console and clicking 'Purchase More Licenses!' These additional licenses will be purchased at a prorated rate so that all licenses expire at the same time as your intitial purchase.
Renew Licenses. You can purchase licenses by going to the Home Page of the Admin Console and clicking 'Renew Now!' This option is only available in the last month of your Enterprise contract.
Note that only Enterprise Administrators can purchase more licenses. Direct link to the Admin Console: https://lastpass.com/enterprise_home.php