In Sitefinity CMS 14.1 the Classic UI was deprecated and it is no longer possible to delete the ~/AdminApp folder. Deleting the folder makes it impossible to use Sitefinity CMS where the New UI is required. To restore the package, you must reinstall the AdminApp NuGet package.
~/AdminApp
To restore the ~/AdminApp folder, perform the following:
Progress.Sitefinity.AdminApp
For more information, see Sitefinity CMS NuGet packages repository
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