Exporting an app finally creates the package application with all necessary information including deployment options.
Instead of using the application, an explicit app version will be used.
You can export the app with the following command:
$ iectl publisher app version export \
--appid "unique id of application on IEM for which you want to perform this operation" \
--exportpath "/path/for/app/file" \
--versionnumber "1.0.0"
# version will be exported to "/path/for/app/file"