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### Installing Additional License Keys

To order an additional license key from Parallels online store, and install it to control panel:

1. Go to Server > License Management.
2. Click Order New Key.
3. The Parallels online store page listing available add-ons will open in a separate browser window. On this page, select the add-ons you want to order and click Submit.
4. Because you already have one license key, the Plesk Number Checking System page will open. Enter the number of your license key to which you add more license keys and click Submit.
5. In the next steps, indicate the currency, number of keys, provide contact details, billing address, and payment method, and submit the form. You will be notified by e-mail when your order is processed.
6. When you receive the e-mail notification, return to the License Management screen (Server > License Management), on the Additional License Keys tab click Retrieve Keys to retrieve the ordered license key. Plesk License Manager will retrieve the upgraded license key from the Parallels licensing server and automatically install it to your control panel.

If you uploaded an additional license key to the control panel, and after that installed the respective application on the server, follow these steps to install the license key:

1. Go to Server > License Management > Additional License Keys.
2. Click the license key you want to install.
3. Click Install Key.