You migrate content with Copy structure and content and Copy content and get the following error:
A method from the WebPartPages service of SharePoint has been deprecated and is preventing the successful copy of a web part, it might be missing or corrupted. Please update ShareGate to the latest version and try again.
Microsoft removed some SharePoint services that ShareGate Desktop would use to migrate your web parts. Because of these changes, older versions of the app are unable to migrate your web parts.
Update ShareGate Desktop to the latest version.