Zencart Module - Bulk Invoice Print and Bulk set order status to dispatch

I have a zencart site version v1.3.9h. I would like to install a module that will enable bulk invoice printing of orders of a certain status and then set those status's to DISPATCHED.

The site is a very busy site with constant traffic so to avoid any disruption I will duplicate the site on a dev environment and you will work on that version - on completion I will test and then I will need some documentation on what files need to be amended/uploaded and what patches (if any) need to be installed to the db.

Please feel free to ask any questions.

Thanks