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Choose one of the options on the Pricing page to obtain Trial, Starter , Business or OpenSource Enterprise registration key. You will receive the key file by email. It will look like that:

Name: Company Name
Email: Contact Email
Purchase ID: CC-777777777777777
Git Committers: 25
Free upgrades untliuntil: 2019-10-31

pjCssAR6cT4F3MnEDb0qKiEcb15UWlPBQwvrZCMlBmbihHrXVnZ2MyJKsUT
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sSPIOdt1sz1@6d6PXEzybYJq1DOaZfXWzogM3jpB4M1hBA1LRJBbOE1qVWH

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Note the use of the sudo command above. Superuser privileges are needed to store key securely. On Windows OS you may need to ensure that register command register     command is run on behalf of the Administrator user.