Hi Petr - Erik is awesome and a valued Qlik Community member. I see he has replied to you, he is the best one to address your concern. If you need further assistance, please let us know.
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According to the documentation CopyApp method ‒ Qlik Sense this only works on server, so there is no point in trying this on desktop.
'The app entity must have been previously created by the repository (via the REST API).'
(from the documentation
Thanks for replay Erik,
It's true - i looked over information that this action isn't possible on DT, but i failed as well on enterprise.
"parameter": "Engine ID not found",
"message": "Resource not found"