Found an issue when using New & Modified Snapshot to capture an App install. As part of the capture Composer 10.33.0 will include in the root of the package a symbiotic link called ".VolumeIcon.icns" that can not be deleted in composer.
If you try it will gray out and not delete. You have to right click/control click and select reveal in Finder. The icns file will not be visible immediately you will need to use the command to reveal hidden files "CMD + Shift + Period". Then you should be able to delete the file. If you still can't edit the file name and remove the period at the beginning. (Thank you @mickl089 for the additional information.) If you don't the resulting pkg will not install and give you this error:
Thanks for the heads-up on this issue! Always good to hear of issues from other JN admins before we run into them. I have been hanging onto and running an older version of Composer for related reasons.