There are 4 files that go into your ZC installation (in addition, there are also license.txt and readme.txt files that you read, rather than installing):
admin -> includes -> boxes -> extra_boxes -> uploads_customers_dhtml.php
admin -> includes -> extra_datafiles -> uploads_filenames.php
admin -> includes -> languages -> english -> extra_definitions -> uploads.php
admin -> uploads.php
So, yes, you're missing some files.
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