Hi, giggle-ite. First of all, are you downloading to a pc or a tablet? On either device you will need a comic reader. If you do not have one installed, I suggest CDisplay Ex for the pc and perfect viewer for the tablet. CDisplay Ex, just look it up on a search engine and install. Perfect viewer is free on the google store.
I have just downloaded the comic to my tablet and it opened fine and all the pages were there.
This is not necessarily to do with your problem but I am now using Opera on my android tablet and it is vastly superior to the built in browser. Opera has also solved the occasional problems I was having on CB+ with password, using the reader and downloading. Cannot recommend it highly enough.
Let us know how you get on. Or if my suggestions are a load of old nonsense.