If you are on a Basic, Advanced or Pro package, you are unable to buy additional projects. However, if you need more you can choose to upgrade your subscription to a package with a higher project allowance.

You can do this yourself by going to 'Settings' and then select the 'Billing' tab on the left-hand side. You will have the option of choosing which package to upgrade to.

If you hold a Business or an Enterprise account, you are may be able to purchase additional bundles of projects dependant upon the terms of your agreement. For more information, you can contact your account manager.