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If the login box is asking for an activation key, you are on the end-user login page. Click the "Log in as a license administrator" link at the bottom of the login box to switch to the administrator login.
Changing your password
To change your password, click Preferences at the top right of the LAC page. The Preferences page lets you enter your old and new password. You must type your password again to confirm it, then click Save to set the new password. (If you've forgotten your password, you can reset it from the login dialog by clicking "Reset your password.")
Adding a license generator
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