A red X is a watermark applied to all Universe plug-ins that have exceeded their 14 day trial period, or if their subscription has not been renewed.
If you are within the 14 day trial or are a current subscriber, try refreshing your Link account within the Red Giant Link application under the gear menu. This will sync Link with our web server, and update your plugins to match your membership subscription.
If you continue to see a red X within your 14 day trial period, or if you are a subscriber, please open a support ticket.
Note for Legacy users: Legacy Premium tools will have a red X unless you have an active Universe subscription. All other Legacy tools should still be available.