How do I use a theme in my app (silverlinings) ?

Hi All,  I see a lot of themes in appstore and also checked out Mendix UI framework. However I am not able to use any of these themes in my app.  When I download a theme into my app and configure in the project settings(theme) it gives me an error that .zip is nor supported anymore and use UI resources from appstore.  Please help me understand how can I use any of those themes in my application . I have tried checking in the community but no articles available that are helpful.  Thanks so much for help
1 answers

In the themes folder, unzip the theme’s zipped file and remove the theme zipped filename from the project settings.

Hope it helps!