Adding to kdmemory’s great suggestions. Before re-installing Captivate, if you are indeed on a compatible CP version (Win 11 needs 11.8, which is subscription only) try the usual troubleshooting scenarios:

• Check if there is any .lck file in the project folder, which would mean that the project has not been closed correctly. You can safely delete those lck files.
• Clear the cache which can be done from Preferences. That menu is available on the Welcome screen.
• Clean the Preferences. You need to close Captivate, look in the installation folder for the subfolder ‘utils’ and run the CleanPreferencesWin.bat file. Restart Captivate.
• Eventually the Layouts folder (has the themes) could have become corrupt, but try first the scenarios mentioned above.

More info in:

http://blog.lilybiri.com/tips-for-troubleshooting

Can you open any other cptx file apart from “NCR.cptx”?

If not, try re-installing Captivate.

Also, if you installed Windows 11, you know that you need Captivate Version 11.8?

Klaus