Taking a quick look at the code, there are no core file overwrites and I check before using the v1.5.0+ functions. The code should work, it just won't integrate into your v1.3.9h admin's menu structure so you'll need to enter its address directly into your browser:
yourhost.com/YOUR_ADMIN/all_invoices.php
yourhost.com/YOUR_ADMIN/all_packingslips.php
If it doesn't work in a ZC 1.3.9h environment, just remove the files copied (the full file list is in the readme).
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