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DownloadDialog for Latte Layouts


I am trying to support the KNS3::DownloadDialog in Latte in order for the user to be able to download Latte Layouts from store.kde.org from inside Latte... But I cant get it to work, the DownloadDialog shows the message

Could not find category "Latte Layouts"

or when I change it to 417 based on: https://store.kde.org/browse/cat/417/ord/latest/

Could not find category "417"

Do you have any ideas what is needed to work?