The code as written requires Adobe Pro installed to work. For the download, I don't think you'll need to attach the library when Pro is already on the workstation, it's already done in this project, but you will for new projects.
I tried the download with just Reader alone installed and it didn't work. I haven't gotten around to trying late binding as suggested by
isladogs yet, so I'm not sure if that would make it work with Reader alone.