If you’re getting an error saying “Plugin could not be activated because it triggered a fatal error.” try one of the following:

• Disable the Free version of the plugin and try to activate the PRO version again;
  • The plugin might ask you if you want to disable the license. Choose that you want to keep the license.
• In case the problem persists, download the PRO version again, making sure it’s a zip file and try to upload again. If it’s not a zip file, zip/archive the folder with the plugin and try again.