Enfold Theme Update overwrite other files in the Enfold theme directories.

I have had a developer creating come custom templates/pages for my WordPress Site with Enfold Theme. They have been placing template files (.php) and image files inside the enfold folders (ie \wp-content\themes\enfold\images).

When I update the Enfold theme the update overwrites all my changes (both code and images).

Couple of questions;

1. Is there anyway to stop the update process from deleting my changes?

If the answer to the above question is no, I assume I have to make sure my developer places all of his changes outside the Enfold theme folders. Is there a place you would recommend based on how your theme operates?

Thanks,
Darryl.