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## License Requirements

You need a valid license key before you can install Parallels Pro Control Panel 10.3.1. When you buy Parallels Pro Control Panel from the the online store (http://www.parallels.com/en/buyonline/pro/), you receive the license key in the order confirmation email from Parallels.

Parallels Pro Control Panel 10.3.1 requires a valid license for a pre-determined number of sites, for example, a 250-domain license.