[Theme Horse Support Team]

@je

WordPress shows that message if you are trying to upload the same theme that is currently activate into your site.
Just activate any theme first and delete the Interface Pro theme from your theme directory and try uploading the new version of Interface Pro theme and then activate it.

Note: Make sure that you backup the previous version of Interface Pro theme for safe side if something goes wrong but if there is no any customization in the theme code you can delete it without backup.

Thank you!