Multisite license activation
Before you attempt this, ensure that your license is either Volume or Ultimate. These are the only licenses that allow activation on WordPress multisite installations. Unlimited subsites are supported. Gravity Flow does not need to be network activated, but it can be.
To activate your license on multisite:
1. Activate Gravity Flow on the main site.
2. Enter your license key in the Workflow->Settings page of the main site.
3. Deactivate Gravity Flow on the main site or leave it activated.
Updates will be displayed on the plugins page of each site that has Gravity Flow activated.