Are you trying to update an existing story? If that's the case it's possible that old chapters downloaded with an earlier version of the plugin won't be overwritten, you will need to completely overwrite it.
I downloaded a story using the
link mentioned in this post, and did successfully download the images with the latest version of the plugin.
Again: What makes you so sure that this is the problem? Are the images simply not being displayed, or are you really opening up the e-book file and inspecting various HTML tags for their attributes? Are you maybe simply missing
this setting in the plugin options dialogue?