If your subscription has expired, a will be generated. However, to obtain a permanent license key for the latest version, you must renew your subscription.
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Regardless of platform, the registration code remains consistent: If your subscription has expired, a will be generated
Register in Application_Start method of Global.asax.cs : If your subscription has expired
Navigate to > License & Downloads > Downloads and Keys . Click the Get License Key link. In the pop-up, select the Version (v31.x.x or higher).