Ok, thanks for the suggestion. I put it in the UPLOADS directory but there is nowhere to define it on the OPTIONS page under the SLIDESHOW tab. I also have it in the NextGen Gallery folder, as the NextGen website indicates. So, the file is there.
BUT THE PROBLEM IS DEFINING IT.
When I click on the OPTIONS page and select the SLIDESHOW tab, there is absolutely nothing there other than a tiny icon which looks like a screen. All the other tabs under OPTIONS (i.e. General Options, Thumbnails, Images, gallery, effects, watermark) have something in them but not the slideshow tab.
Does this plugin only work with the latest version of wordpress? Maybe the slideshow had a bug that wasn't fixed until the latest version?