- Ensure that you've the latest version installed on your computer. For more information, see Update Creative Cloud apps.
- Close the Adobe InDesign application, if it's open.
Download the following plugins to resolve the issue for Windows and macOS respectively:
To install and run the plugin, follow the same steps as listed above for InDesign. Ensure that you select the Adobe InCopy 2020 application folder on Windows and Adobe InCopy 2020 application on macOS.